Matplotlib (pyplot) savefig outputs blank image
First, what happens when T0 is not None? I would test that, then I would adjust the values I pass to plt.subplot(); maybe try values 131, 132, and 133, or values that depend whether or not T0 exists.
Second, after plt.show() is called, a new figure is created. To deal with this, you can
Call
plt.savefig('tessstttyyy.png', dpi=100)before you callplt.show()Save the figure before you
show()by callingplt.gcf()for "get current figure", then you can callsavefig()on thisFigureobject at any time.
For example:
fig1 = plt.gcf()plt.show()plt.draw()fig1.savefig('tessstttyyy.png', dpi=100)In your code, 'tesssttyyy.png' is blank because it is saving the new figure, to which nothing has been plotted.
plt.show() should come after plt.savefig()
Explanation: plt.show() clears the whole thing, so anything afterwards will happen on a new empty figure
change the order of the functions fixed the problem for me:
- first Save the plot
- then Show the plot
as following:
plt.savefig('heatmap.png')plt.show()