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I am trying to make a graph of k (as in k-means) vs error, and I can't get it to show the actual number of k on the x-axis (1-15, not just the even numbers), nor any any numbers at all if I add a title to X.

I have looked at the data frame documentation and the matplotlib axes documentation, and I couldn't find anything telling me how to get it to show the numbers? Even if I have to manually specify them?

Please see images below:

rdf.plot.line(title='Number of clusters Vs mean accuracy')

graph with bad xaxis numbers

rdf.plot.line(title='Number of clusters Vs mean accuracy',
                x='parameters',
                y='mean_validation_score')

enter image description here

I don't understand how to get the x axis to show all 15 numbers (1-15).

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  • $\begingroup$ Are the values of $k$ in your DataFrame? $\endgroup$ Sep 12, 2018 at 15:49
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    $\begingroup$ They are, in the form of a column of dicts: 0 {'n_clusters': 1} 1 {'n_clusters': 2} 2 {'n_clusters': 3} etc. $\endgroup$ Sep 12, 2018 at 15:53
  • $\begingroup$ I would collapse that column into a purely numeric column, so that you can set it as the x= part of your plot command. $\endgroup$ Sep 12, 2018 at 15:56
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    $\begingroup$ Thanks @AdrianKeister , turns out that was (most of) the answer I used in the end. I extracted a list of the numbers and added them as the xtick parameter. $\endgroup$ Sep 12, 2018 at 20:25
  • $\begingroup$ You're quite welcome! $\endgroup$ Sep 12, 2018 at 20:27

1 Answer 1

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Use xticks. e.g.

x=np.arange(1,16)
y = -60000*(3+np.log(1/x))
plt.plot(x,y,'b')
plt.xticks(x)
plt.show()

example of xticks

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  • $\begingroup$ Thanks, I would upvote it but I don't have enough popularity points. $\endgroup$ Sep 12, 2018 at 20:13
  • $\begingroup$ @ChorHataraHud'uKeturi No worries. Glad it helps. $\endgroup$
    – user12075
    Sep 12, 2018 at 22:17

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