Help with streaming data to Jupyter - IPython is not defined error

[elsevers]

I am trying to follow the instructions here on real time streaming of data over Ethernet to a Jupyter Lab Notebook. I am getting stymied by the magic %matplotlib notebook: when I run plot = AMDC_LivePlot(logger, 'foo') , I get the error:

Javascript Error: IPython is not defined

Some Google searching tells me that I need to install ipympl -- so I did:

conda install ipympl

Still no luck. Further Google searching indicates I may need to rebuild Jupyter (really???). I tried this with a command line command of jupyter lab build but the build process failed.

Before pressing on further, I want to ask -- am I on the right track here? Or is there a much easier path to get this going?

[Bharat-Ramadas]

Are you able to make normal plots using matplotlib on Jupyter? I ran into a similar issue were I was unable to make any kind of plots on Jupyter with matplotlib and had to reinstall my Miniconda installation to get things working.

[elsevers]

Yes. I am able to follow all the buffered logging instructions just fine. For example, this block of code gives me a nice plot:

logger.log(duration=0.1)
data = logger.dump()
data[0:.01].plot()

(Pandas plots with matplotlib, right??)

[npetersen2]

@elsevers

Are you using the Jupyter Lab or Notebook environment?

https://stackoverflow.com/questions/50982686/what-is-the-difference-between-jupyter-notebook-and-jupyterlab

[elsevers]

I have been using Jupyter Lab. Should I be using Notebook instead?

[elsevers]

So... in Jupyter Lab this magic works for me:

%matplotlib ipympl

I can now stream in real time. Yay!! 👍

(But is it recommended that I use notebook instead?)

[elsevers]

The decorator

%matplotlib widget

also works for me.

So, in summary, this issue was due to my use of Jupyter Lab, whereas the instructions were for Jupyer Notebook. In Jupyter Lab, I was able to resolve the issue by:

1. installing ipympl (conda install ipympl) and
2. using the decorator %matplotlib widget (instead of %matplotlib notebook)