From ed16a02b8280f4f64775eee366685f17b0897972 Mon Sep 17 00:00:00 2001 From: yuping0924 <1066056393@qq.com> Date: Tue, 16 Nov 2021 13:09:17 +0800 Subject: [PATCH 01/11] =?UTF-8?q?2021-11-16-python=E5=9F=BA=E7=A1=80?= =?UTF-8?q?=E7=9F=A5=E8=AF=86?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ...72\347\241\200\347\237\245\350\257\206.md" | 133 ++++++++++++++++++ 1 file changed, 133 insertions(+) create mode 100644 "docs/views/data/2021-11-16-python\345\237\272\347\241\200\347\237\245\350\257\206.md" diff --git "a/docs/views/data/2021-11-16-python\345\237\272\347\241\200\347\237\245\350\257\206.md" "b/docs/views/data/2021-11-16-python\345\237\272\347\241\200\347\237\245\350\257\206.md" new file mode 100644 index 00000000..fa2f38dc --- /dev/null +++ "b/docs/views/data/2021-11-16-python\345\237\272\347\241\200\347\237\245\350\257\206.md" @@ -0,0 +1,133 @@ +--- +layout: post +title: python的基本语法知识及部分函数 +date: 2021-11-12 +author: yuping0924 +categories: + - 数据分析部 +tags: + - python +--- +##输入和打印 ： + 输入和赋值为同一步骤，且变量的类型为输入值的类型，同时，在输入的同时加上引号还可以打印字符串。 + + 例如： + temp=input("猜猜我心里想的是哪个数字"), + +其中temp 是变量名，= 执行赋值操作，input为输入函数，()必须要有，""在要打印字符串时必须加上。 打印的函数为 print()， + + 例如： + print("你猜对啦")， + 其用法与 input 基本相同。 + +##变量赋值和字符串： + 变量赋值格式： 变量名 = 赋值内容（可以是常量，表达式，之前出现过的变量），字符串相加会变成拼接的形式， + + 例如：a = 'A'+'B' + 打印：AB + 当字符串中间要出现单引号或双引号时需要加转义字符 \ + + 例如：'Let \'s go' + 打印：Let's go + +如需要输出的内容中需要有 \ 的出现，第一可以用原始字符串：在字符串前加上一个 r + + 例如：a = r'C:\now' + 打印：C:\now + 此方法可解决多个 \ 的输出，但最后一个字符不能是 \ + 第二可以再 \ 后面直接加转义字符 \ + + 例如：a = 'C:\\now' + 打印：C:\now + +如果需要得到一个跨多行的字符串，需要用到长字符串：在字符串的首尾加上3个连续的单引号或双引号， + + 例如："""西财的校训是： + 经世济民， + 孜孜以求。""" + 打印：西财的校训是： + 经世济民， + 孜孜以求。 + +##条件分支: + + if 条件 : + 条件符合时执行的语句 + else : + 条件不符合时执行的语句 + 注意：在冒号换行后必须要缩进才代表条件成立时需要执行的所有语句。 +连续的条件分支可写成： + + if 条件1 : + elif 条件2 : + elif 条件3 : + ...... + 条件表达式：x if 条件 else y + 意为如果条件成立，就返回x，不成立，就返回y。 + +##循环语句： + + while 循环的格式 + while 条件 : + +for 循环的格式 + + for 目标(变量) in 表达式（字符串，元组，列表，字典等）：循环体 + +##类型转换（str 字符串 ，int 整形 ，float 浮点型）： + + 类型 (内容) + 例如：a=5.99 + b=int (a) + 打印：b=5 + +##获取类型的信息： + + ·type () 例如： a=5.2 + type (a) + 打印：class' float ' + + ·isinstance () 例如： a='西财' + isinstance(a,str) + 打印：true + +##函数： + + random.randint()表示返回一个随机的整数 + + 例如：a = random.randint(1,10) 表示返回1到10中间的任意一个整数 + + range([start,] stop [,step]) + + ###括号中有三个参数，其中用[]括起来的表示参数可选 + + ###step = 1 表示默认值是1 + +###range()的作用是生成一个从start 参数开始到stop参数的值结束的数字序列 + + 例1：range(5) + 打印：0~4中的任意一个整数 + + range(5) 相当于range(0,5),打印时包括左边的数值但不包括右边的数值 + + 例2：for i in range(1,10,2): + print(i) + 打印：1 3 5 7 9 + + 最后的2表示每相隔两个数打印一次 + + list() :表示以列表的形式输出 + len() :计算字符串的长度 + + + + + + + + + + + + + From fc2e3d18c9129e98ba99d8c791da819716ba134f Mon Sep 17 00:00:00 2001 From: yuping0924 <1066056393@qq.com> Date: Sat, 20 Nov 2021 22:23:08 +0800 Subject: [PATCH 02/11] =?UTF-8?q?python=20turtle=20=E6=97=B6=E9=92=9F?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../python turtle\346\227\266\351\222\237.md" | 78 +++++++++++++++++++ 1 file changed, 78 insertions(+) create mode 100644 "docs/views/data/python turtle\346\227\266\351\222\237.md" diff --git "a/docs/views/data/python turtle\346\227\266\351\222\237.md" "b/docs/views/data/python turtle\346\227\266\351\222\237.md" new file mode 100644 index 00000000..0c225449 --- /dev/null +++ "b/docs/views/data/python turtle\346\227\266\351\222\237.md" @@ -0,0 +1,78 @@ +--- +layout: post +title: python turtle 时钟画法 +date: 2021-11-20 +author: yuping0924 +categories: + - 数据分析部 +tags: + - 时钟程序 + - python turtle +--- + + #引入turtle datetime 和time 三个函数库 + import turtle as t + import datetime as dt + import time + #设置窗口大小 + t.setup(600,600) + #隐藏画图的轨迹，这里的0就代表False + t.tracer(0) + t.speed(0) + t.hideturtle() + #定义函数画时钟 + def draw_clock(h,m,s): + t.clear()#因为要多次重复画图每次将屏幕清空后才不会闪现 + t.penup() + t.pensize(3) + t.goto(0,-210)#移动画笔，使圆出现在正中间 + t.setheading(0)#上一步后画笔指向正东，要将其指向正上方 + t.pendown() + t.circle(210) + + #画刻度 + t.left(90) + t.penup() + t.goto(0,0)#将画笔放回正中间 + #利用循环画刻度 + for __ in range(12): + t.penup() + t.forward(190) + t.pendown() + t.forward(20) + t.penup() + t.goto(0,0) + t.right(30) + #画时针 + t.pensize(5) + t.right(h/12*360) + t.pendown() + t.forward(70) + + #画分针和秒针 + t.penup() + t.goto(0,0) + t.setheading(90) + t.pendown() + t.right(m/60*360) + t.forward(110) + + t.penup() + t.goto(0,0) + t.setheading(90) + t.pendown() + t.right(s/60*360) + t.forward(170) + + #重置画笔位置 + t.penup() + t.goto(-75,-70) + s="{}年{}月{}日".format(now.year,now.month,now.day) + t.write(s,"center",font=["Arial","20"]) + #用循环无限更新指针位置 + while True: + t.update()#更新前面隐藏的轨迹，使画面出现 + time.sleep(1)#延迟一秒画图，减少占用的内存 + #实时更新 + now=dt.datetime.now() + draw_clock(now.hour,now.minute,now.second) From 4541f206e9a372cc5cc8ad6299a14ccf58475d35 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E9=B1=BC=E7=9A=AE=E7=9A=AE?= <93482057+yuping0924@users.noreply.github.com> Date: Fri, 26 Nov 2021 16:48:46 +0800 Subject: [PATCH 03/11] function3 --- 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z#Oo6%$2bB;`D`$uU^)wi0=^qRfll2~#{fJXQutw?6u1x4MnpNUIG}rD#N?us?I24giSr|M|+=5h@3^+uD6%w+kokR@Nv8fx@ zmeOS177rss64j=8B+5|&;C-`6tGfr^K{rA$itEb^EvpA=ucj?U73n%P9G>c8!HxIV zBO#*%5((ps?W&_BWc>4{8pvXJ@-z$TOy}D}%M8441czM+EqFDNInt^U>c7LfrKKpL zxn-)aBt|0miH>pF_QrX8cWEs=j$v4#Ra$<6UtW|M0UWq5MLK&4mdL z66Z`ky?bCBPzF>|A<8h+<9XQf;YWu!p#GLWH~jamuy@5465d=j2&qBF@G@~I+&G*r tQ={;L@EcVS{H&n~i2wid?|vH{pT*o4O2qUwIogrWz_PSode*`->fbga+#Ub` literal 0 HcmV?d00001 From 26642cf90366961c2c49bc02259252479ce6c473 Mon Sep 17 00:00:00 2001 From: yuping0924 <1066056393@qq.com> Date: Sun, 28 Nov 2021 19:55:47 +0800 Subject: [PATCH 04/11] =?UTF-8?q?2021-11-28=20matplotlib=20=E7=94=BB?= =?UTF-8?q?=E5=9B=BE=E4=B8=8A?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ...ib\347\224\273\345\233\276\344\270\212.md" | 161 ++++++++++++++++++ .../imgs/2021/12/yuping0924/Figure_3.png | Bin 0 -> 24406 bytes 2 files changed, 161 insertions(+) create mode 100644 "docs/views/data/matplotlib\347\224\273\345\233\276\344\270\212.md" create mode 100644 docs/views/imgs/2021/12/yuping0924/Figure_3.png diff --git "a/docs/views/data/matplotlib\347\224\273\345\233\276\344\270\212.md" "b/docs/views/data/matplotlib\347\224\273\345\233\276\344\270\212.md" new file mode 100644 index 00000000..c7a8a573 --- /dev/null +++ "b/docs/views/data/matplotlib\347\224\273\345\233\276\344\270\212.md" @@ -0,0 +1,161 @@ +--- +layout: post +title: matplotlib画图上 +date: 2021-11-26 +author: yuping0924 +categories: + - 数据分析部 +tags: + - matplotlib +--- + +#### 引入函数库 + +import matplotlib.pyplot as plt +mport numpy as np + +#### 打印函数 + +plt.plot(x,y) +plt.show() [这个函数是将图像展示出来，在结尾处必须要有] +注：plt.plot(x,y,color='red',linewitdth=1.0,linestyle="--") +color用来规定线段的颜色，linewidth用来表示线段的宽窄，linestyle用来表示线段的类型 + +#### plt.figure()的用处 + +plt.figure(num=1,figsize=(8,5), dpi=None, facecolor=None, edgecolor=None, frameon=True) + +num表示图像的编号，figsize改变图像的长和宽，dpi表示分辨率，默认为80，facecolor表示背景色，edgecolor表示边框颜色，frameon表示是否显示边框 + +##### 1.同时生成多个独立窗口 + +在每个函数前加上：plt.figure() +例如： +plt.figure() +plt.plot(x,y1) +plt.figure() +plt.plot(x,y2) +plt.show() +##### 2.将两个函数图像放在一个窗口 + +在一个figure下生成两次图像 +例如： +plt.figure() +plt.plot(x,y1) +plt.plot(x,y2) +#### 坐标轴设置 + +##### 1.设置取值范围 + +plt.xlim((a,b)) 表示X轴 +plt.ylim((a,b)) 表示Y轴 +##### 2.设置名称 + +plt.xlabel('X轴') +plt.ylabel('Y轴') +##### 3.替换下标值 + +1.举例说明： +a=np.linspace(-1,2,5) +print(a) +plt.xticks(a) +plt.yticks([-2,-1.8,-1,1.22,3], +['really bad','bad','normal','good','really good']) +此时，Y轴中的-2被替换成really bad, -1.8被替换成bad,以此类推 + + +2.plt.xticks用法说明(plt.yticks同理)： +plt.xticks(locs,[labels],**kwargs) +locs:表示一个范围，可设置为range(1,13,1)类似 +[labels]:可任意赋值，且是一一对应 +**kwargs:是用于控制label的参数 +如果想隐藏刻度可将Y轴输为空值或不设置，即：plt.xticks(x,())或plt.xticks(x) + +##### 4.改变坐标轴位置 + +a = plt.gca() 此处gca是'get current axis'即取出坐标轴，必有 +1.改变单个坐标轴颜色 +a.spines['right'].set_color('none') +其中spines['right']表示选择右边的轴线，none表示无色 + + +2.设置某条边为X或Y轴 +a.xaxis.set_ticks_position('bottom') +a.yaxis.set_ticks_position('left') +表示将底部的轴设置为X轴，左边的设置为Y轴 + + +3.改变位置 +a.spines['bottom'].set_position(('data',0)) +a.spines['left'].set_position(('data',0)) +表示将下面的轴放到y=0的位置，将左边的轴放到x=0的位置 +注：这里的data表示Y轴的数值，也可用axes移动位置，此时0处表示的是百分比，若为0.1，就表示10% + +#### 添加注释 + +##### 1.强调某一个点 + +举例说明： +x0=1 +y0=2*x0+1 +plt.scatter(x0,y0,s=50,color='blue') +plt.plot([x0,x0],[y0,0],'k--',linewidth=2.5) +其中scatter表示打印点状，s表示点的大小，color是颜色 +plot表示打印线段，[x0,x0],[y0,0]表示X=1的图像，'k--'是简写，k表示颜色是黑色，'--'表示线段的样式是虚线 + +##### 2.添加文本说明 + +用plt.text(): +plt.text(x,y,s,fontdict=None,withdash=False,**kwargs) +x,y:放置text的位置 +s:text的内容 +fontdict:定义s的格式 +其他参数： +fontsize:设置字体大小，默认12 +fontweight:设置字体粗细，可用数字表示，也可用标准的名称 +fontstyle:设置字体类型，可选参数['normal'|'italic'|'oblique'] +backgroundcolor:设置字体背景色 + +举例： +plt.text(-3.7,3,r'$This\ is\ the\ text\ \mu\ \sigma_1\ \alpha_2$',fontdict={'size':16,'color':'red'}) +plt.show() +此处涉及文本中空格和特殊字符表示，需要在空格和特殊字符前加上转义字符 \ 转换，若要在字符后加上下标就在字符和下标中间加上下划线 _ 即可 + +#### 代码展示 +```python +import matplotlib.pyplot as plt +import numpy as np + +x = np.linspace(-3,3,50) +y = 2*x+1 + +plt.figure(num=1,figsize=(8,5)) +plt.plot(x,y) + +a = plt.gca() +a.spines['right'].set_color('none') +a.spines['top'].set_color('none') +a.xaxis.set_ticks_position('bottom') +a.yaxis.set_ticks_position('left') +a.spines['bottom'].set_position(('data',0)) +a.spines['left'].set_position(('data',0)) + + +x0=1 +y0=2*x0+1 +plt.scatter(x0,y0,s=50,color='blue') +plt.plot([x0,x0],[y0,0],'k--',linewidth=2.5) + + +plt.text(-3.7,4,r'$This\ is\ \mu\ \sigma_i\ \alpha_t$', + fontsize=16,fontweight=10,fontstyle='italic') + +plt.text(-3.7,3,r'$This\ is\ \mu\ \sigma_i\ \alpha_t$', + fontsize=16,backgroundcolor='yellow') +plt.text(-3.7,2,r'$This\ is\ \mu\ \sigma_i\ \alpha_t$', + fontdict={'size':16,'color':'red'}) + + +plt.show() +``` +![Figure_3.png](https://i.loli.net/2021/11/28/89BIubinorveALO.png) \ No newline at 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z#Oo6%$2bB;`D`$uU^)wi0=^qRfll2~#{fJXQutw?6u1x4MnpNUIG}rD#N?us?I24giSr|M|+=5h@3^+uD6%w+kokR@Nv8fx@ zmeOS177rss64j=8B+5|&;C-`6tGfr^K{rA$itEb^EvpA=ucj?U73n%P9G>c8!HxIV zBO#*%5((ps?W&_BWc>4{8pvXJ@-z$TOy}D}%M8441czM+EqFDNInt^U>c7LfrKKpL zxn-)aBt|0miH>pF_QrX8cWEs=j$v4#Ra$<6UtW|M0UWq5MLK&4mdL z66Z`ky?bCBPzF>|A<8h+<9XQf;YWu!p#GLWH~jamuy@5465d=j2&qBF@G@~I+&G*r tQ={;L@EcVS{H&n~i2wid?|vH{pT*o4O2qUwIogrWz_PSode*`->fbga+#Ub` literal 0 HcmV?d00001 From 27abe0c98f6018e14efb1019f4772daf28a73ca1 Mon Sep 17 00:00:00 2001 From: yuping0924 <1066056393@qq.com> Date: Sun, 28 Nov 2021 23:25:51 +0800 Subject: [PATCH 05/11] =?UTF-8?q?Update=202021-11-16-python=E5=9F=BA?= =?UTF-8?q?=E7=A1=80=E7=9F=A5=E8=AF=86.md?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ...\272\347\241\200\347\237\245\350\257\206.md" | 17 +---------------- 1 file changed, 1 insertion(+), 16 deletions(-) diff --git "a/docs/views/data/2021-11-16-python\345\237\272\347\241\200\347\237\245\350\257\206.md" "b/docs/views/data/2021-11-16-python\345\237\272\347\241\200\347\237\245\350\257\206.md" index fa2f38dc..2241ea7f 100644 --- "a/docs/views/data/2021-11-16-python\345\237\272\347\241\200\347\237\245\350\257\206.md" +++ "b/docs/views/data/2021-11-16-python\345\237\272\347\241\200\347\237\245\350\257\206.md" @@ -8,8 +8,6 @@ categories: tags: - python --- -##输入和打印 ： - 输入和赋值为同一步骤，且变量的类型为输入值的类型，同时，在输入的同时加上引号还可以打印字符串。 例如： temp=input("猜猜我心里想的是哪个数字"), @@ -22,19 +20,17 @@ tags: ##变量赋值和字符串： 变量赋值格式： 变量名 = 赋值内容（可以是常量，表达式，之前出现过的变量），字符串相加会变成拼接的形式， +#### 变量赋值和字符串： 例如：a = 'A'+'B' 打印：AB - 当字符串中间要出现单引号或双引号时需要加转义字符 \ 例如：'Let \'s go' 打印：Let's go -如需要输出的内容中需要有 \ 的出现，第一可以用原始字符串：在字符串前加上一个 r 例如：a = r'C:\now' 打印：C:\now - 此方法可解决多个 \ 的输出，但最后一个字符不能是 \ 第二可以再 \ 后面直接加转义字符 \ 例如：a = 'C:\\now' @@ -49,13 +45,11 @@ tags: 经世济民， 孜孜以求。 -##条件分支: if 条件 : 条件符合时执行的语句 else : 条件不符合时执行的语句 - 注意：在冒号换行后必须要缩进才代表条件成立时需要执行的所有语句。 连续的条件分支可写成： if 条件1 : @@ -65,7 +59,6 @@ tags: 条件表达式：x if 条件 else y 意为如果条件成立，就返回x，不成立，就返回y。 -##循环语句： while 循环的格式 while 条件 : @@ -74,24 +67,18 @@ for 循环的格式 for 目标(变量) in 表达式（字符串，元组，列表，字典等）：循环体 -##类型转换（str 字符串 ，int 整形 ，float 浮点型）： - 类型 (内容) 例如：a=5.99 b=int (a) 打印：b=5 -##获取类型的信息： - ·type () 例如： a=5.2 type (a) 打印：class' float ' - ·isinstance () 例如： a='西财' isinstance(a,str) 打印：true -##函数： random.randint()表示返回一个随机的整数 @@ -99,11 +86,9 @@ for 循环的格式 range([start,] stop [,step]) - ###括号中有三个参数，其中用[]括起来的表示参数可选 ###step = 1 表示默认值是1 -###range()的作用是生成一个从start 参数开始到stop参数的值结束的数字序列 例1：range(5) 打印：0~4中的任意一个整数 From 521ae589e20cae3efaadf773e69f55fa6e52530f Mon Sep 17 00:00:00 2001 From: yuping0924 <1066056393@qq.com> Date: Sun, 28 Nov 2021 23:28:43 +0800 Subject: [PATCH 06/11] =?UTF-8?q?Update=202021-11-16-python=E5=9F=BA?= =?UTF-8?q?=E7=A1=80=E7=9F=A5=E8=AF=86.md?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ...6-python\345\237\272\347\241\200\347\237\245\350\257\206.md" | 2 -- 1 file changed, 2 deletions(-) diff --git "a/docs/views/data/2021-11-16-python\345\237\272\347\241\200\347\237\245\350\257\206.md" "b/docs/views/data/2021-11-16-python\345\237\272\347\241\200\347\237\245\350\257\206.md" index 2241ea7f..d66586ea 100644 --- "a/docs/views/data/2021-11-16-python\345\237\272\347\241\200\347\237\245\350\257\206.md" +++ "b/docs/views/data/2021-11-16-python\345\237\272\347\241\200\347\237\245\350\257\206.md" @@ -18,8 +18,6 @@ tags: print("你猜对啦")， 其用法与 input 基本相同。 -##变量赋值和字符串： - 变量赋值格式： 变量名 = 赋值内容（可以是常量，表达式，之前出现过的变量），字符串相加会变成拼接的形式， #### 变量赋值和字符串： 例如：a = 'A'+'B' From dc28547825fe41d849976a7d1a4b92305c84b293 Mon Sep 17 00:00:00 2001 From: yuping0924 <1066056393@qq.com> Date: Fri, 3 Dec 2021 21:44:04 +0800 Subject: [PATCH 07/11] =?UTF-8?q?2021-12-3-matplotlib=20=E7=94=BB=E5=9B=BE?= =?UTF-8?q?-yuping0924?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ...72\347\241\200\347\237\245\350\257\206.md" | 21 ++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git "a/docs/views/data/2021-11-16-python\345\237\272\347\241\200\347\237\245\350\257\206.md" "b/docs/views/data/2021-11-16-python\345\237\272\347\241\200\347\237\245\350\257\206.md" index d66586ea..6339f297 100644 --- "a/docs/views/data/2021-11-16-python\345\237\272\347\241\200\347\237\245\350\257\206.md" +++ "b/docs/views/data/2021-11-16-python\345\237\272\347\241\200\347\237\245\350\257\206.md" @@ -8,6 +8,8 @@ categories: tags: - python --- +#### 输入和打印 ： +输入和赋值为同一步骤，且变量的类型为输入值的类型，同时，在输入的同时加上引号还可以打印字符串。 例如： temp=input("猜猜我心里想的是哪个数字"), @@ -19,16 +21,21 @@ tags: 其用法与 input 基本相同。 #### 变量赋值和字符串： + 变量赋值格式： 变量名 = 赋值内容（可以是常量，表达式，之前出现过的变量），字符串相加会变成拼接的形式， 例如：a = 'A'+'B' 打印：AB +当字符串中间要出现单引号或双引号时需要加转义字符 \ 例如：'Let \'s go' 打印：Let's go +如需要输出的内容中需要有 \ 的出现， +第一可以用原始字符串：在字符串前加上一个 r 例如：a = r'C:\now' 打印：C:\now +此方法可解决多个 \ 的输出，但最后一个字符不能是 \ 第二可以再 \ 后面直接加转义字符 \ 例如：a = 'C:\\now' @@ -43,11 +50,13 @@ tags: 经世济民， 孜孜以求。 +#### 条件分支: if 条件 : 条件符合时执行的语句 else : 条件不符合时执行的语句 +注意：在冒号换行后必须要缩进才代表条件成立时需要执行的所有语句。 连续的条件分支可写成： if 条件1 : @@ -57,6 +66,7 @@ tags: 条件表达式：x if 条件 else y 意为如果条件成立，就返回x，不成立，就返回y。 +#### 循环语句： while 循环的格式 while 条件 : @@ -65,18 +75,25 @@ for 循环的格式 for 目标(变量) in 表达式（字符串，元组，列表，字典等）：循环体 +#### 类型转换（str 字符串 ，int 整形 ，float 浮点型）： + +类型 (内容) 例如：a=5.99 b=int (a) 打印：b=5 +#### 获取类型的信息： ++ type () 例如： a=5.2 type (a) 打印：class' float ' ++ isinstance () 例如： a='西财' isinstance(a,str) 打印：true +#### 函数： random.randint()表示返回一个随机的整数 @@ -84,9 +101,11 @@ for 循环的格式 range([start,] stop [,step]) + + 括号中有三个参数，其中用[]括起来的表示参数可选 - ###step = 1 表示默认值是1 + + step = 1 表示默认值是1 ++ range()的作用是生成一个从start 参数开始到stop参数的值结束的数字序列 例1：range(5) 打印：0~4中的任意一个整数 From cea223876be018e5c25c6925758e98cfb19ecab1 Mon Sep 17 00:00:00 2001 From: yuping0924 <1066056393@qq.com> Date: Fri, 3 Dec 2021 21:45:10 +0800 Subject: [PATCH 08/11] =?UTF-8?q?Revert=20"2021-12-3-matplotlib=20?= =?UTF-8?q?=E7=94=BB=E5=9B=BE-yuping0924"?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This reverts commit dc28547825fe41d849976a7d1a4b92305c84b293. --- ...72\347\241\200\347\237\245\350\257\206.md" | 21 +------------------ 1 file changed, 1 insertion(+), 20 deletions(-) diff --git "a/docs/views/data/2021-11-16-python\345\237\272\347\241\200\347\237\245\350\257\206.md" "b/docs/views/data/2021-11-16-python\345\237\272\347\241\200\347\237\245\350\257\206.md" index 6339f297..d66586ea 100644 --- "a/docs/views/data/2021-11-16-python\345\237\272\347\241\200\347\237\245\350\257\206.md" +++ "b/docs/views/data/2021-11-16-python\345\237\272\347\241\200\347\237\245\350\257\206.md" @@ -8,8 +8,6 @@ categories: tags: - python --- -#### 输入和打印 ： -输入和赋值为同一步骤，且变量的类型为输入值的类型，同时，在输入的同时加上引号还可以打印字符串。 例如： temp=input("猜猜我心里想的是哪个数字"), @@ -21,21 +19,16 @@ tags: 其用法与 input 基本相同。 #### 变量赋值和字符串： - 变量赋值格式： 变量名 = 赋值内容（可以是常量，表达式，之前出现过的变量），字符串相加会变成拼接的形式， 例如：a = 'A'+'B' 打印：AB -当字符串中间要出现单引号或双引号时需要加转义字符 \ 例如：'Let \'s go' 打印：Let's go -如需要输出的内容中需要有 \ 的出现， -第一可以用原始字符串：在字符串前加上一个 r 例如：a = r'C:\now' 打印：C:\now -此方法可解决多个 \ 的输出，但最后一个字符不能是 \ 第二可以再 \ 后面直接加转义字符 \ 例如：a = 'C:\\now' @@ -50,13 +43,11 @@ tags: 经世济民， 孜孜以求。 -#### 条件分支: if 条件 : 条件符合时执行的语句 else : 条件不符合时执行的语句 -注意：在冒号换行后必须要缩进才代表条件成立时需要执行的所有语句。 连续的条件分支可写成： if 条件1 : @@ -66,7 +57,6 @@ tags: 条件表达式：x if 条件 else y 意为如果条件成立，就返回x，不成立，就返回y。 -#### 循环语句： while 循环的格式 while 条件 : @@ -75,25 +65,18 @@ for 循环的格式 for 目标(变量) in 表达式（字符串，元组，列表，字典等）：循环体 -#### 类型转换（str 字符串 ，int 整形 ，float 浮点型）： - -类型 (内容) 例如：a=5.99 b=int (a) 打印：b=5 -#### 获取类型的信息： -+ type () 例如： a=5.2 type (a) 打印：class' float ' -+ isinstance () 例如： a='西财' isinstance(a,str) 打印：true -#### 函数： random.randint()表示返回一个随机的整数 @@ -101,11 +84,9 @@ for 循环的格式 range([start,] stop [,step]) - + 括号中有三个参数，其中用[]括起来的表示参数可选 - + step = 1 表示默认值是1 + ###step = 1 表示默认值是1 -+ range()的作用是生成一个从start 参数开始到stop参数的值结束的数字序列 例1：range(5) 打印：0~4中的任意一个整数 From 99295b9f8540b0270b5fe13ddbde4466f6bcaef6 Mon Sep 17 00:00:00 2001 From: yuping0924 <1066056393@qq.com> Date: Fri, 3 Dec 2021 21:47:08 +0800 Subject: [PATCH 09/11] =?UTF-8?q?2021-12-3-matplotlib=20=E7=94=BB=E5=9B=BE?= =?UTF-8?q?=E4=B8=8B-yuping0924?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ...ib\347\224\273\345\233\276\344\270\213.md" | 327 ++++++++++++++++++ 1 file changed, 327 insertions(+) create mode 100644 "docs/views/data/matplotlib\347\224\273\345\233\276\344\270\213.md" diff --git "a/docs/views/data/matplotlib\347\224\273\345\233\276\344\270\213.md" "b/docs/views/data/matplotlib\347\224\273\345\233\276\344\270\213.md" new file mode 100644 index 00000000..9ef93df6 --- /dev/null +++ "b/docs/views/data/matplotlib\347\224\273\345\233\276\344\270\213.md" @@ -0,0 +1,327 @@ +--- +layout: post +title: matplotlib 画图下 +date: 2021-12-3 +author: yupinng0924 +categories: + - 数据分析部 +tags: + - matplotlib 画图 +--- +#### tick能见度 +此处的tick是指坐标刻度的数字及其背后的背景，改变能见度需要用到bbox（）函数，特别注明，在较新的python版本中，需要在plot的时候加上zorder的设置 + +举例说明： +``` +import matplotlib.pyplot as plt +import numpy as py + +x=py.linspace(-3,3,50) +y=0.2*x + +plt.figure() +plt.plot(x,y,zorder=1,linewidth=10) +plt.ylim(-2,2) + +ax=plt.gca() +ax.spines['right'].set_color('none') +ax.spines['top'].set_color('none') +ax.xaxis.set_ticks_position('bottom') +ax.yaxis.set_ticks_position('left') +ax.spines['bottom'].set_position(('data',0)) +ax.spines['left'].set_position(('data',0)) + +for label in ax.get_xticklabels() + ax.get_yticklabels() : + label.set_fontsize(12) + label.set_bbox(dict(facecolor='white',edgecolor='none',alpha=0.7)) + +plt.show() +``` +![能见度.png](https://i.loli.net/2021/12/03/V1PptnbUmilIZHq.png) +dict()用于创建一个字典，facecolor设置背景颜色，edgecolor设置边框颜色，alpha设置透明度，从0（完全透明）到1（完全不透明） + +zorder解释：是用于确定补丁，线条，文本（此为默认顺序，对应为1，2，3）的绘制顺序的，任何一个单独的plot()调用都可以为特定的该项设置zorder，zorder的值越小改项就在越上面 +#### 散点图 +打印直接用：scatter()函数 ，可设置（s点的大小，alpha透明度，c颜色）等 +举例说明： +``` +import matplotlib.pyplot as plt +import numpy as np + +n=1024 +x = np.random.normal(0,1,n) +y = np.random.normal(0,1,n) + +##x=np.linspace(-3,3) +##y=2*x+1 +plt.scatter(x,y,s=75,alpha=0.5) +plt.xlim((-2,2)) +plt.ylim((-2,2)) +plt.xticks(()) +plt.yticks(()) + +plt.show() +``` +![散点图_1.png](https://i.loli.net/2021/12/03/BZ6bocud8N2931g.png) +![散点图_2.png](https://i.loli.net/2021/12/03/F6ToGHejpYMWqhK.png) +#### 柱状图 +打印用：bar()函数，可设置(facecolor矩形的颜色，edgecolor边框色)，朝向（在y前面加上负号）等 +举例说明： +``` +import matplotlib.pyplot as plt +import numpy as np + +n=12 +X=np.arange(n) +y1=(1-X/float(n))*np.random.uniform(0.5,1.0,n) +y2=(1-X/float(n))*np.random.uniform(0.5,1.0,n) + +plt.bar(X,y1,facecolor='green',edgecolor='white') +plt.bar(X,-y2) + +for x,y in zip(X,y1): + plt.text(x,y+0.05,'%.2f'%y,ha='center',va='bottom') + +for x,y in zip(X,y2): + plt.text(x,-y-0.05,'%.2f'%y,ha='center',va='top') + + +plt.xlim(-3,n) +plt.ylim(-1.25,1.25) +plt.xticks(()) +plt.yticks(()) + +plt.show() +``` +说明：zip()可以同时赋多个值，其参数可以是多个列表，元组，字典，集合，字符串，以及range（）区间构成的列表。ha 是横向对齐（horizon alignment），va是纵向对齐 +![柱状图.png](https://i.loli.net/2021/12/03/75LfPIYysJ8XHtC.png) +#### 等高线图 +首先要绘制底图：用contourf()函数，其参数为（长， 宽， 高，分成部份数（最低为2），透明度alpha，颜色camp ） + +上色需要用到camp，其设置方式有三种： + + + camp=plt.get_camp('rad') + + camp='red' + + camp=plt.cm.binary + +然后生成等高线：用contour()函数,其参数为（长，宽，高，分成部分数，颜色，线宽） +举例说明： +``` +import matplotlib.pyplot as plt +import numpy as np + +def f(x,y): + return (1-x/2+x**5+y**3)*np.exp(-x**2-y**2) + +n=256 +x=np.linspace(-3,3,n) +y=np.linspace(-3,3,n) +X,Y=np.meshgrid(x,y) + +plt.contourf(X,Y,f(X,Y),8,alpha=0.75,cmap=plt.cm.hot) + +C=plt.contour(X,Y,f(X,Y),8,colors='black',linewidths=0.5) + +plt.clabel(C,inline=1,fontsize=10) + +plt.xticks(()) +plt.yticks(()) +plt.show() +``` +注：inline=1(Ture)表示将数值嵌套在线里面 +![等高线图.png](https://i.loli.net/2021/12/03/aJn6kpl4mdLKX71.png) +#### 生成图片 +用inshow()函数，其参数为（数据，颜色camp,起始位置origin='upper'/'lower'） +用colorbar()生成颜色标注，参数可为（长度比例shrink，位置location） +举例说明： +``` +import matplotlib.pyplot as plt +import numpy as np + +a=np.array([0.31,0.38,0.42, + 0.49,0.51,0.43, + 0.62,0.55,0.72]).reshape(3,3) + +plt.imshow(a,interpolation='none',cmap='bone',origin='lower') +plt.colorbar(shrink=0.7) + + +plt.xticks(()) +plt.yticks(()) +plt.show() +``` +![生成图片.png](https://i.loli.net/2021/12/03/ahOLrHbzxdFSgDJ.png) +#### 3D数据 +首先要新增函数库：from mpl_toolkits.mplot3d import Axes3D +举例说明： + +``` +import matplotlib.pyplot as plt +import numpy as np +from mpl_toolkits.mplot3d import Axes3D + +##创建一个窗口 +fig=plt.figure() +##生成一个3D坐标 +ax=Axes3D(fig) +X=np.arange(-4,4,0.25) +Y=np.arange(-4,4,0.25) +##把x,y放到网格图上 +X,Y =np.meshgrid(X,Y) +R=np.sqrt(X**2+Y**2) +Z=np.sin(R) + +ax.plot_surface(X,Y,Z,rstride=1,cstride=1,cmap=plt.get_cmap('rainbow')) +ax.contourf(X,Y,Z,zdir='z',offset=-2,cmap='rainbow') +ax.set_zlim(-2,2) +plt.show() +``` +注：rstride表示横线间隔，cstride表示竖线间隔，zdir='z'，表示从z轴俯视，offset表示从哪个坐标点开始 +![3D数据.png](https://i.loli.net/2021/12/03/SwdHAzRGqnmku9U.png) +#### 在一个窗口中放多个坐标图 ++ 方法一：用subplot()函数，此函数只能均分,其参数为（行数，列数，位置） +``` +import matplotlib.pyplot as plt + +plt.figure() +plt.subplot(2,2,1) +plt.plot([0,1],[0,1]) + +plt.subplot(2,2,2) +plt.plot([0,1],[0,2]) + +plt.subplot(2,2,3) +plt.plot([0,2],[0,4]) + +plt.subplot(2,2,4) +plt.plot([0,5],[0,2]) + + +plt.figure() +plt.subplot(2,1,1) +plt.plot([0,1],[0,1]) + +plt.subplot(2,3,4) +plt.plot([0,1],[0,2]) + +plt.subplot(2,3,5) +plt.plot([0,2],[0,4]) + +plt.subplot(2,3,6) +plt.plot([0,5],[0,2]) + +plt.show() +``` +![Figure_1.png](https://i.loli.net/2021/12/03/9jvAETq1FRXCytg.png) ++ 方法二： +用subplot2grid()函数，它能够在画布特定位置创建axes对象（绘图区），使用不同数量的行列数，进行非等分的分割，再按照绘图区的大小来展示结果。其参数为（划分形式（3，3），起始位置（0，0），rowspan占的行数,colspan占的列数） ++ 方法三： +先引入函数库：import matplotlib.gridspec as gridspec +再用gridspec.GridSpec()函数生成初始形状，参数为（行数，列数） +最后对每个axes用subplot()函数确定位置 ++ 方法四： +用plt.subplots()函数，返回一个包含fig和axes对象的元组，因此使用fig,ax=plt,subplots()将元组分为fig和ax两个变量， +例如：f,((ax11,ax12),(ax21,ax22))=plt.subplots(行数，列数，sharex=Ture共享x轴,sharey=Ture共享y轴) +举例说明： +``` +import matplotlib.pyplot as plt +import matplotlib.gridspec as gridspec + +plt .figure() +ax1 = plt.subplot2grid((3,3),(0,0),colspan=3,rowspan=1) +ax1.plot([1,2],[1,2]) +ax1.set_title('ax1') +ax2 = plt.subplot2grid((3,3),(1,0),colspan=2,rowspan=2) +ax2.plot([2,3],[3,5]) +ax2.set_title('ax2') +ax3 = plt.subplot2grid((3,3),(1,2),colspan=1,rowspan=2) +ax3.plot([-2,1],[-1,3]) +ax3.set_title('ax3') + +plt.figure() +gs = gridspec.GridSpec(3,3) +ax1 = plt.subplot(gs[0,:]) +ax1.set_title('ax1_1') +ax2 = plt.subplot(gs[1,:2]) +ax2.set_title('ax2_2') +ax3 = plt.subplot(gs[1:,2]) +ax3.set_title('ax3_3') +ax4 = plt.subplot(gs[2,0]) +ax4.set_title('ax4_4') +ax5 = plt.subplot(gs[2,1]) +ax5.set_title('ax5_5') + + +plt.figure() +f,((ax11,ax12),(aax21,ax22)) = plt.subplots(2,2,sharex=True,sharey=True) +ax11.scatter([1,2],[1,2]) +ax12.scatter([-1,-2],[1,2]) + +plt.show() +``` +![Figure_2.png](https://i.loli.net/2021/12/03/WdzXplc19o8YiEy.png) +![Figure_3.png](https://i.loli.net/2021/12/03/EMa53v9Zm1kYCry.png) +![Figure_4.png](https://i.loli.net/2021/12/03/ycpPGjWSCnidQAf.png) +#### 再一个图中再嵌套图形 +重点是确定图片的位置： +left,bottom,width,height=0.1,0.1,0.8,0.8(通过改变百分比来改变位置) +ax1（坐标名）=fig.add_axes([left,bottom,width,height]) +或者：plt.axes([left,bottom,width,height]) +举例说明： +``` +import matplotlib.pyplot as plt + +fig = plt.figure() +x = [1,2,3,4,5,6,7] +y = [1,3,4,2,5,8,6] + +left,bottom,width,height = 0.1,0.1,0.8,0.8 +ax1 = fig.add_axes([left,bottom,width,height]) +ax1.plot(x,y,'red') +ax1.set_xlabel('x') +ax1.set_ylabel('y') +ax1.set_title('title') + + +left,bottom,width,height = 0.2,0.6,0.25,0.25 +ax2 = fig.add_axes([left,bottom,width,height]) +ax2.plot(y[::-1],x,'blue') +ax2.set_xlabel('x') +ax2.set_ylabel('y') +ax2.set_title('inside_1') + +x1= [1,2,3,4,5,6,7] +y1= [2,5,3,4,7,1,4] +plt.axes([0.6,0.2,0.25,0.25]) +plt.plot(y1,x1,'green') +plt.xlabel('x') +plt.ylabel('y') +plt.title('inside_2') + +plt.show() +``` +![图中图.png](https://i.loli.net/2021/12/03/nCb8vjiNt6pc7Dk.png) +#### 设置主次坐标轴 +重点用twinx()函数，例如：ax2=ax1.twinx()将ax1的y轴镜面反映到ax2的y轴 +举例说明： +``` +import matplotlib.pyplot as plt +import numpy as np + +x = np.arange(0,10,0.1) +y1 = 0.05*x**2 +y2 = -1*x + +fig,ax1 = plt.subplots() +ax2 = ax1.twinx() +ax1.plot(x,y1,'g-') +ax2.plot(x,y2,'b--') + +ax1.set_xlabel('X') +ax1.set_ylabel('Y1',color='green') +ax2.set_ylabel('Y2',color='blue') + +plt.show() +``` +![主次坐标轴.png](https://i.loli.net/2021/12/03/mX4asEJjRNycOYL.png) + From c3d506cb3c84e972eb04c6527beb30df78d08467 Mon Sep 17 00:00:00 2001 From: yuping0924 <1066056393@qq.com> Date: Sun, 10 Apr 2022 13:24:35 +0800 Subject: [PATCH 10/11] =?UTF-8?q?Create=20=E6=95=B0=E6=8D=AE=E6=8C=96?= =?UTF-8?q?=E6=8E=98=E5=9F=BA=E7=A1=80=E7=9F=A5=E8=AF=86.md?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ...72\347\241\200\347\237\245\350\257\206.md" | 113 ++++++++++++++++++ 1 file changed, 113 insertions(+) create mode 100644 "docs/views/data/\346\225\260\346\215\256\346\214\226\346\216\230\345\237\272\347\241\200\347\237\245\350\257\206.md" diff --git "a/docs/views/data/\346\225\260\346\215\256\346\214\226\346\216\230\345\237\272\347\241\200\347\237\245\350\257\206.md" "b/docs/views/data/\346\225\260\346\215\256\346\214\226\346\216\230\345\237\272\347\241\200\347\237\245\350\257\206.md" new file mode 100644 index 00000000..dc59cadc --- /dev/null +++ "b/docs/views/data/\346\225\260\346\215\256\346\214\226\346\216\230\345\237\272\347\241\200\347\237\245\350\257\206.md" @@ -0,0 +1,113 @@ +--- +layout: post +title:数据挖掘 +date: 2019-05-05 +author: yuping +categories: + -数据分析部 +tags: + - 数据挖掘基础知识 +--- +###数据挖掘的定义： +数据挖掘是从大量的，不完全的，有噪音的，模糊的随机的数据中提取隐含在其中的，人们事先不知道的，但又潜在有效的信息和知识的过程。 +###数据挖掘的过程： +数据：是未经组织的数字、词语、声音、图像等，是对某种情况的记录。 +信息：在数据之上的数据之间的一些关系。 +知识：从信息中可以推导出的结论。 + +数据 ---(筛选)---> 目标数据 ---(预处理)--->已预处理数据 ---(变换)---> 变换后数据 ---(数据挖掘)---> 模式 ---(解释/评价)--->知识 +###数据挖掘的主要内容： +####关联规则挖掘： +概念：找到事物A和B的联系，例如沃尔玛超市啤酒与尿布的销量在周末总会同时出现增长的案例。 +包括：Apriori算法和FP-growth算法 +####标签分类/数值预测： +概念：通过大量的训练集得到数据的类别特征，再通过类别特征将新输入的数据进行分类（输出数值）。 +包括：贝叶斯，决策树，最邻近，逻辑回归，支持向量，神经网络，集成算法 + +通常分为两步：第一步，学习建模，即收集大量的训练样本，通过分类算法建立一个分类模型；第二步，分类测试（预测测试），即输入新的测试数据，通过模型推测结果。 +####聚类： +概念：通过一些相似性算法直接将数据分成不同的类或簇，同一类（簇）相似度高，不同的类（簇）之间差别较大。 +包括：K均值，层次聚类，密度聚类 + +分类与聚类的差别： + +数据分类：先给定标准，然后按照标准来进行分类 +数据聚类：一群事物中找共同性，然后按照找出的共同性来分类新的事物 +####数据预处理： +包括数据清洗，数据集成，数据归约，数据规范 +###数据类型和统计： + +1. 数据对象：代表了一个实体（例如，客户，患者等），也可被称为样品，实例，示例，数据点，对象，元组。 +2. 数据集：由数据对象组成。 +3. 数据属性：一个数据字段，代表一个数据对象的特征或功能。 +4. 数据库中的行，对应数据对象；列，对应属性。 +####数据属性类型 +1. 标称类型数据：此类型数据的状态是可列举的，例如，颜色，职业，身份证号码，邮政编码，婚姻状态等。 +此类型包括特殊的二进制类型数据（只包含两种状态），其分为对称二进制（两种数据规模相当）和不对称二进制（两种数据规模差距很大） + +2. 序数类型数据：有一个有意义的顺序，但不知道两个排名之间的差距有多大。例如，分为大中小三个等级，但每两个等级之间的差距不清楚。 + +3. 区间类型数据：以单位长度顺序性度量，其值是有序的，不存在零点，即不适用于乘法运算，例如，温度，日历等。 + +4. 比率标度类型数据：值是有序的，有固定的零点，即可以进行乘法运算，例如，长度，重量等。 +####数据统计汇总 +中性化趋势：平均值，中位数，众数，截断均值 +分布趋势：方差和标准差，分位数 + +###数据可视化 +箱线图：可以分析多个属性数据的分布差异，找到相应属性数据的离群点。 +直方图：分析单个属性在各个区间变化分布，发现特征对类别的区分度。 +散点图：用来显示数据的相关性分布（正相关，负相关，不相关）。 +###数据相似性 +数据矩阵：N行表示N个数据，P列表示P个维度。 +相异矩阵：用来储存n个对象两两之间的相似性，通常表示为三角矩阵。 +相似度：度量两个对象有多相似，值越大越相似，取值[0，1]。 +相异度：度量两个对象差别程度，值越小越相似，最小相异度为0，取值0到正无穷。 +邻近性：指相似度或相异度。 +####标称属性的邻近性度量 +![](E:/Desktop\学习\数据分析部\数据挖掘\Screenshot_20220409_174242_com.netease.edu.ucmooc.jpg) +方法：简单匹配 +d(i,j) = (p-m)/p +m为匹配次数（相同情况），p为属性总数 +####二进制属性的邻近性度量 +![](E:/Desktop\学习\数据分析部\数据挖掘\Screenshot_20220409_174204.jpg) +1. 建立一个邻接表 + +![](E:/Desktop\学习\数据分析部\数据挖掘\Screenshot_20220409_174129.jpg) + +1. 对称的二进制距离度量： +d(i,j) = (r+s)/(q+r+s+t) + +3. 不对称的二进制距离度量： +d(i,j) = (r+s)/(q+r+s) + +4. 杰卡德相似系数： +d(i,j) = q/(q+r+s) + +####数值属性的邻近性度量 +![](E:/Desktop\学习\数据分析部\数据挖掘\Screenshot_20220409_174256_com.netease.edu.ucmooc.jpg) +闵可夫斯基距离 + +![](E:/Desktop\学习\数据分析部\数据挖掘\Screenshot_20220409_175242_com.netease.edu.ucmooc.jpg) + +曼哈顿距离 +欧氏距离 +上确界距离(两个数据的距离中最大的一个) +![](E:/Desktop\学习\数据分析部\数据挖掘\Screenshot_20220409_175306_com.netease.edu.ucmooc.jpg) + + +###数据预处理 + +####数据清洗 +代码教学： +https://scikit-learn.org/stable/modules/impute.html#impute +#####处理丢失数据 +1. 忽略元组：当类标号缺少时，删除这条数据，但若删除过多，其效果会变差 +2. 手动填写遗漏值 +3. 自动填写：使用属性的平均值填充空缺值 +#####处理噪音数据 +箱线图检测离群点：删除离群点 +#####处理不一致的数据 +1. 计算推理，替换 +2. 全局替换 + From e62339497973cc971735805c9e63cc67c95768b9 Mon Sep 17 00:00:00 2001 From: yp <1066056393@qq.com> Date: Sun, 30 Oct 2022 14:28:54 +0800 Subject: [PATCH 11/11] yuping --- ...345\206\231\346\225\260\345\255\227.ipynb" | 568 ++++++++++++++++++ 1 file changed, 568 insertions(+) create mode 100644 "docs/views/data/\346\211\213\345\206\231\346\225\260\345\255\227.ipynb" diff --git "a/docs/views/data/\346\211\213\345\206\231\346\225\260\345\255\227.ipynb" "b/docs/views/data/\346\211\213\345\206\231\346\225\260\345\255\227.ipynb" new file mode 100644 index 00000000..82947406 --- /dev/null +++ "b/docs/views/data/\346\211\213\345\206\231\346\225\260\345\255\227.ipynb" @@ -0,0 +1,568 @@ +{ + "cells": [ + { + "cell_type": "code", + "execution_count": 157, + "metadata": {}, + "outputs": [], + "source": [ + "import numpy\n", + "import matplotlib.pyplot as plt\n", + "import scipy.special" + ] + }, + { + "cell_type": "code", + "execution_count": 158, + "metadata": {}, + "outputs": [], + "source": [ + "data_file = open(\"E:\\OneDrive\\文档\\数据集\\手写数字MNIST\\mnist_train_100.txt\",\"r\")\n", + "data_list = data_file.readlines()\n", + "data_file.close()" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "在对文件数据进行操作时不能先关闭文件\n", + "调用方法时要记得加括号" + ] + }, + { + "cell_type": "code", + "execution_count": 159, + "metadata": {}, + "outputs": [], + "source": [ + "# len(data_list)\n", + "# print(data_list)" + ] + }, + { + "cell_type": "code", + "execution_count": 160, + "metadata": {}, + "outputs": [ + { + "name": "stderr", + "output_type": "stream", + "text": [ + "d:\\Anaconda3\\envs\\pytorch38\\lib\\site-packages\\ipykernel_launcher.py:7: MatplotlibDeprecationWarning: Case-insensitive properties were deprecated in 3.3 and support will be removed two minor releases later\n", + " import sys\n" + ] + }, + { + "data": { + "image/png": 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+ "text/plain": [ + "
" + ] + }, + "metadata": {}, + "output_type": "display_data" + } + ], + "source": [ + "from configparser import Interpolation\n", + "from numpy import imag\n", + "\n", + "\n", + "all_values = data_list[0].split(',')\n", + "imag_array = numpy.asfarray(all_values[1:]).reshape((28,28))\n", + "plt.imshow(imag_array,cmap=\"gray\",Interpolation='none')\n", + "plt.show()" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "plt.imshow()后面加上plt.show()才能显示，plt.imshow()仅仅是生成图像" + ] + }, + { + "cell_type": "code", + "execution_count": 161, + "metadata": {}, + "outputs": [], + "source": [ + "class neuralNetwork:\n", + " # 初始化\n", + " def __init__(self,inputnodes,hiddennodes,outputnodes,learningrate):\n", + " # 设置输入层，隐藏层，输出层的节点数\n", + " self.inodes = inputnodes\n", + " self.hnodes = hiddennodes\n", + " self.onodes = outputnodes\n", + "\n", + " # 定义链接的权重矩阵，此处是根据正态分布初始化\n", + " self.wih = numpy.random.normal(0.0,pow(self.hnodes,-0.5),(self.hnodes,self.inodes))\n", + " self.who = numpy.random.normal(0.0,pow(self.hnodes,-0.5),(self.onodes,self.hnodes))\n", + "\n", + " # 设置学习率\n", + " self.lr = learningrate\n", + "\n", + " # 定义激活函数\n", + " self.activation_function = lambda x:scipy.special.expit(x) \n", + " pass\n", + "\n", + " # 训练\n", + " def train(self,input_list,output_list):\n", + " # 将列表转为数组\n", + " inputs = numpy.array(input_list,ndmin=2).T\n", + " targets = numpy.array(output_list,ndmin=2).T\n", + "\n", + " # 计算隐藏层的输入\n", + " hidden_inputs = numpy.dot(self.wih,inputs)\n", + " # 将结果输入激活函数作为下一层的输入\n", + " hidden_outputs =self.activation_function(hidden_inputs)\n", + " # 计算输出层的输入\n", + " final_inputs = numpy.dot(self.who,hidden_outputs)\n", + " # 将结果输入激活函数作为最后输出\n", + " final_outputs = self.activation_function(final_inputs)\n", + "\n", + " # 计算误差\n", + " output_errors = targets-final_outputs\n", + " hidden_errors = numpy.dot(self.who.T,output_errors)\n", + "\n", + " # 更新权重\n", + " self.who += self.lr*numpy.dot((output_errors*final_outputs*(1.0-final_outputs)),numpy.transpose(hidden_outputs))\n", + " self.wih += self.lr*numpy.dot((hidden_errors*hidden_outputs*(1.0-hidden_outputs)),numpy.transpose(inputs))\n", + "\n", + " def query(self,input_list):\n", + " # 将列表转为数组\n", + " inputs = numpy.array(input_list,ndmin=2).T\n", + "\n", + " # 计算隐藏层的输入\n", + " hidden_inputs = numpy.dot(self.wih,inputs)\n", + " # 将结果输入激活函数作为下一层的输入\n", + " hidden_outputs =self.activation_function(hidden_inputs)\n", + " # 计算输出层的输入\n", + " final_inputs = numpy.dot(self.who,hidden_outputs)\n", + " # 将结果输入激活函数作为最后输出\n", + " final_outputs = self.activation_function(final_inputs)\n", + "\n", + " return final_outputs\n" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "训练模型" + ] + }, + { + "cell_type": "code", + "execution_count": 162, + "metadata": {}, + "outputs": [], + "source": [ + "input_nodes = 784\n", + "hidden_nodes = 200\n", + "output_nodes = 10\n", + "\n", + "learning_rate = 0.1\n", + "epoch = 50\n", + "\n", + "n = neuralNetwork(input_nodes,hidden_nodes,output_nodes,learning_rate)" + ] + }, + { + "cell_type": "code", + "execution_count": 163, + "metadata": {}, + "outputs": [], + "source": [ + "training_data_file = open(\"E:\\OneDrive\\文档\\数据集\\手写数字MNIST\\mnist_train_100.txt\",\"r\")\n", + "training_data_list = training_data_file.readlines()\n", + "training_data_file.close()" + ] + }, + { + "cell_type": "code", + "execution_count": 164, + "metadata": {}, + "outputs": [], + "source": [ + "for i in range(epoch):\n", + " for record in training_data_list:\n", + " all_values = record.split(\",\")\n", + " inputs = (numpy.asfarray(all_values[1:])/255.0*0.99)+0.1\n", + " targets = numpy.zeros(output_nodes)+0.01\n", + " targets[int(all_values[0])] = 0.99\n", + " outputs = n.train(inputs,targets)" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "测试模型" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [] + }, + { + "cell_type": "code", + "execution_count": 165, + "metadata": {}, + "outputs": [], + "source": [ + "test_data_file = open(\"E:\\OneDrive\\文档\\数据集\\手写数字MNIST\\mnist_test_10.txt\",\"r\")\n", + "test_data_list = test_data_file.readlines()\n", + "test_data_file.close()" + ] + }, + { + "cell_type": "code", + "execution_count": 166, + "metadata": {}, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "7\n" + ] + } + ], + "source": [ + "# 获取测试集的第一个值\n", + "all_values2 = test_data_list[0].split(\",\")\n", + "print(all_values2[0])" + ] + }, + { + "cell_type": "code", + "execution_count": 167, + "metadata": {}, + "outputs": [ + { + "data": { + "image/png": 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+ "text/plain": [ + "
" + ] + }, + "metadata": {}, + "output_type": "display_data" + } + ], + "source": [ + "image_array = numpy.asfarray(all_values2[1:]).reshape((28,28))\n", + "plt.imshow(image_array,cmap=\"gray\",interpolation='none')\n", + "plt.show()" + ] + }, + { + "cell_type": "code", + "execution_count": 168, + "metadata": {}, + "outputs": [ + { + "data": { + "text/plain": [ + "array([[0.01224118],\n", + " [0.00445431],\n", + " [0.03148557],\n", + " [0.01233577],\n", + " [0.00438021],\n", + " [0.03198868],\n", + " [0.00109165],\n", + " [0.96160137],\n", + " [0.00850337],\n", + " [0.01706819]])" + ] + }, + "execution_count": 168, + "metadata": {}, + "output_type": "execute_result" + } + ], + "source": [ + "n.query((numpy.asfarray(all_values2[1:])/255.0*0.99)+0.1)" + ] + }, + { + "cell_type": "code", + "execution_count": 169, + "metadata": {}, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "7 correct_label\n", + "7 answer\n", + "2 correct_label\n", + "2 answer\n", + "1 correct_label\n", + "1 answer\n", + "0 correct_label\n", + "0 answer\n", + "4 correct_label\n", + "4 answer\n", + "1 correct_label\n", + "1 answer\n", + "4 correct_label\n", + "9 answer\n", + "9 correct_label\n", + "4 answer\n", + "5 correct_label\n", + "1 answer\n", + "9 correct_label\n", + "9 answer\n", + "0 correct_label\n", + "0 answer\n", + "6 correct_label\n", + "9 answer\n", + "9 correct_label\n", + "7 answer\n", + "0 correct_label\n", + "0 answer\n", + "1 correct_label\n", + "1 answer\n", + "5 correct_label\n", + "3 answer\n", + "9 correct_label\n", + "7 answer\n", + "7 correct_label\n", + "7 answer\n", + "3 correct_label\n", + "3 answer\n", + "4 correct_label\n", + "4 answer\n", + "9 correct_label\n", + "9 answer\n", + "6 correct_label\n", + "6 answer\n", + "6 correct_label\n", + "1 answer\n", + "5 correct_label\n", + "5 answer\n", + "4 correct_label\n", + "4 answer\n", + "0 correct_label\n", + "0 answer\n", + "7 correct_label\n", + "7 answer\n", + "4 correct_label\n", + "4 answer\n", + "0 correct_label\n", + "0 answer\n", + "1 correct_label\n", + "1 answer\n", + "3 correct_label\n", + "3 answer\n", + "1 correct_label\n", + "1 answer\n", + "3 correct_label\n", + "3 answer\n", + "4 correct_label\n", + "4 answer\n", + "7 correct_label\n", + "8 answer\n", + "2 correct_label\n", + "2 answer\n", + "7 correct_label\n", + "7 answer\n", + "1 correct_label\n", + "1 answer\n", + "2 correct_label\n", + "1 answer\n", + "1 correct_label\n", + "1 answer\n", + "1 correct_label\n", + "1 answer\n", + "7 correct_label\n", + "7 answer\n", + "4 correct_label\n", + "4 answer\n", + "2 correct_label\n", + "2 answer\n", + "3 correct_label\n", + "3 answer\n", + "5 correct_label\n", + "3 answer\n", + "1 correct_label\n", + "9 answer\n", + "2 correct_label\n", + "2 answer\n", + "4 correct_label\n", + "4 answer\n", + "4 correct_label\n", + "4 answer\n", + "6 correct_label\n", + "6 answer\n", + "3 correct_label\n", + "3 answer\n", + "5 correct_label\n", + "4 answer\n", + "5 correct_label\n", + "3 answer\n", + "6 correct_label\n", + "4 answer\n", + "0 correct_label\n", + "0 answer\n", + "4 correct_label\n", + "4 answer\n", + "1 correct_label\n", + "1 answer\n", + "9 correct_label\n", + "4 answer\n", + "5 correct_label\n", + "5 answer\n", + "7 correct_label\n", + "7 answer\n", + "8 correct_label\n", + "8 answer\n", + "9 correct_label\n", + "9 answer\n", + "3 correct_label\n", + "2 answer\n", + "7 correct_label\n", + "4 answer\n", + "4 correct_label\n", + "9 answer\n", + "6 correct_label\n", + "1 answer\n", + "4 correct_label\n", + "4 answer\n", + "3 correct_label\n", + "3 answer\n", + "0 correct_label\n", + "0 answer\n", + "7 correct_label\n", + "7 answer\n", + "0 correct_label\n", + "0 answer\n", + "2 correct_label\n", + "2 answer\n", + "9 correct_label\n", + "8 answer\n", + "1 correct_label\n", + "1 answer\n", + "7 correct_label\n", + "7 answer\n", + "3 correct_label\n", + "3 answer\n", + "2 correct_label\n", + "7 answer\n", + "9 correct_label\n", + "9 answer\n", + "7 correct_label\n", + "7 answer\n", + "7 correct_label\n", + "7 answer\n", + "6 correct_label\n", + "6 answer\n", + "2 correct_label\n", + "2 answer\n", + "7 correct_label\n", + "7 answer\n", + "8 correct_label\n", + "4 answer\n", + "4 correct_label\n", + "4 answer\n", + "7 correct_label\n", + "7 answer\n", + "3 correct_label\n", + "3 answer\n", + "6 correct_label\n", + "6 answer\n", + "1 correct_label\n", + "1 answer\n", + "3 correct_label\n", + "3 answer\n", + "6 correct_label\n", + "6 answer\n", + "9 correct_label\n", + "9 answer\n", + "3 correct_label\n", + "3 answer\n", + "1 correct_label\n", + "1 answer\n", + "4 correct_label\n", + "4 answer\n", + "1 correct_label\n", + "9 answer\n", + "7 correct_label\n", + "3 answer\n", + "6 correct_label\n", + "6 answer\n", + "9 correct_label\n", + "4 answer\n" + ] + } + ], + "source": [ + "scorecard = []\n", + "\n", + "for code in test_data_list:\n", + " all_values = code.split(\",\")\n", + " correct_label = int(all_values[0])\n", + " print(correct_label,\"correct_label\")\n", + " inputs = (numpy.asfarray(all_values[1:]) / 255.0 * 0.99) + 0.01\n", + " outputs = n.query(inputs)\n", + " label = numpy.argmax(outputs)\n", + " print(label,\"answer\")\n", + " if(correct_label==label):\n", + " scorecard.append(1)\n", + " else:\n", + " scorecard.append(0)" + ] + }, + { + "cell_type": "code", + "execution_count": 170, + "metadata": {}, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "[1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0]\n", + "performance = 0.74\n" + ] + } + ], + "source": [ + "print(scorecard)\n", + "scorecard_array = numpy.asarray(scorecard) \n", + "print (\"performance = \", scorecard_array.sum() / scorecard_array.size)" + ] + } + ], + "metadata": { + "kernelspec": { + "display_name": "Python 3.6.15 ('pytorch38')", + "language": "python", + "name": "python3" + }, + "language_info": { + "codemirror_mode": { + "name": "ipython", + "version": 3 + }, + "file_extension": ".py", + "mimetype": "text/x-python", + "name": "python", + "nbconvert_exporter": "python", + "pygments_lexer": "ipython3", + "version": "3.6.15" + }, + "orig_nbformat": 4, + "vscode": { + "interpreter": { + "hash": "dfb7ab611ee6793a2bf93701295d770513e1e2edb32d16599c78c4ba42795f3f" + } + } + }, + "nbformat": 4, + "nbformat_minor": 2 +}