Plot chapter 2 not working

[daledet]

From Chapter 2 P.35 - Should the following code be nested under the function or under the for loop?

    plot_decision_regions(X, y, classifier=ppn)
    plt.xlabel('sepal length [cm]')
    plt.ylabel('petal length [cm]')
    plt.legend(loc='upper left')
    plt.show()

I have tried both, and the plot does not show up either way.

[rasbt]

From Chapter 2 P.35 - Should the following code be nested under the function or under the for loop?

No, like you typed it should be fine.

Can you check if something simple like

import matplotlib.pyplot as plt

plt.show([1, 2], [3, 4])

shows a plot?

[daledet]

I just checked, and no that code is not showing a plot.

[rasbt]

That might be some general matplotlib configuration issue then. I recommend debugging that first. It will likely solve the other problem then

[daledet]

OK thanks.
With the other issue. I have the Perceptron class in my code, but it is not working.

[daledet]

None of this is working.
I hate Jupyter notebooks with every fiber of my being.

[rasbt]

Maybe you added the Percpetron class code but didn't execute it?

If things get out of hand, I recommend restartign the notebook and executing all cells

If you are on older jupyter notebook and/or matpltotlib versions, adding and executing

%matplotlib inline

in a cell on top of the notebook may help with showing the plots.

[daledet]

My word! Restart Kernal and Run All Cells is the elixir of life! It is the life force that fuels the dreams of champions!
A decent nap followed by a strong cuppa joe is pretty helpful too. Thanks for guiding me past this first major JN hurdle!

[rasbt]

Nice. Glad it solved the issue