Stretching plot horizontally and vertically with matplotlib? [duplicate]

Question

How do I change the size of figure drawn with Matplotlib?

Answer 1

figure tells you the call signature:

from matplotlib.pyplot import figure

figure(figsize=(8, 6), dpi=80)

figure(figsize=(1,1)) would create an inch-by-inch image, which would be 80-by-80 pixels unless you also give a different dpi argument.

Answer 2

If you've already got the figure created, you can use figure.set_size_inches to adjust the figure size:

fig = matplotlib.pyplot.gcf()
fig.set_size_inches(18.5, 10.5)
fig.savefig('test2png.png', dpi=100)

To propagate the size change to an existing GUI window, add forward=True:

fig.set_size_inches(18.5, 10.5, forward=True)

Additionally as Erik Shilts mentioned in the comments you can also use figure.set_dpi to "[s]et the resolution of the figure in dots-per-inch"

fig.set_dpi(100)