Suggested changes for the Taylor Diagram notebook

[jypeter]

I don't know if I should ping @downiec or @jasonb5 or even if this issue is in the right place

I just had to answer questions from one of our PhD students who discovered the Taylor Diagram tuto by herself (she is not in our team). Great! \o/

I don't know how she generated her input data, but I had some trouble understanding how she was preparing her data before using it for the plot. Then I looked at the tuto, and found out that she was just following what was in there

I thinks the data preparation cells would be easier to understand if they did not use list and zip, and if the data variable was called taylor_data. I'd rather create an empty array and explicitly store the plot data in the columns:

>>> nb_data = len(std)
>>> taylor_data = MV2.zeros((nb_data, 2), dtype=np.float32)
>>> taylor_data[:, 0] = std
>>> taylor_data[:, 1] = corr
>>> taylor_data.id = "My Taylor Diagram Data"
>>> taylor_data
My Taylor Diagram Data
masked_array(
  data=[[1.6 , 0.2 ],
        [1.7 , 0.5 ],
        [1.5 , 0.7 ],
        [1.2 , 0.85],
        [0.8 , 0.9 ],
        [0.9 , 0.95],
        [0.98, 0.99]],
  mask=False,
  fill_value=1e+20,
  dtype=float32)

>>> taylor_data.shape
(7, 2)