How to draw another set of axis on the same figure using matplotlib in python?

Question

I want my mathplotlib figure to have another set of axis/lines. Currently I do as follows:

plt.plot([0,eigenVectors[0][0]],[0,eigenVectors[1][0]],color='k',marker='o')
plt.plot([0,eigenVectors[0][1]],[0,eigenVectors[1][1]],color='k',marker='o')

where eigenVector is a 2d matrix and I am just trying to draw lines passing through the eigenvectors and the origin. However, as it is evident, I am drawing two line segments not lines. I wish to draw two lines passing through origin and the eigenvectors. Is there a way to say that draw a line (not a line segment) passing through two points?

My current plot looks like this:

enter image description here

PS: I am trying to implement PCA.

Just to confirm, that I got it right: You would like to basically replace the two `plt.plot` calls by one and get the same line, right? — jhoepken, Jun 24 '15 at 14:35
Each plt.plot call draws a line segment, I want to replace each with something that draws a line. — Abhishek Chauhan, Jun 24 '15 at 14:37
So you would like to get rid of the entire 2 calls to `plt.plot` and replace it with something that just draws a line? Even though `plt.plot` does this? — jhoepken, Jun 24 '15 at 14:42

score 0 · Answer 1 · edited May 23 '17 at 10:26

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You could extrapolate linearly to some large values and use them to plot the lines. Then limit the plt.xlim and plt.ylim to some sensible value. For more information on the extrapolation, see this post.

edited May 23 '17 at 10:26

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answered Jun 24 '15 at 14:48

jhoepken

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This draws a line segment between the two points given. I want a line, not a line segment. By line I mean it should extend indefinitely and not just confine itself between the two points. – Abhishek Chauhan Jun 24 '15 at 14:54

How to draw another set of axis on the same figure using matplotlib in python?

1 Answers1