How do you change the size of figures drawn with Matplotlib?
Solution 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.
Solution 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)
Solution 3:
Using plt.rcParams
There is also this workaround in case you want to change the size without using the figure environment. So in case you are using plt.plot()
for example, you can set a tuple with width and height.
import matplotlib.pyplot as plt
plt.rcParams["figure.figsize"] = (20,3)
This is very useful when you plot inline (e.g., with IPython Notebook). As asmaier noticed, it is preferable to not put this statement in the same cell of the imports statements.
To reset the global figure size back to default for subsequent plots:
plt.rcParams["figure.figsize"] = plt.rcParamsDefault["figure.figsize"]
Conversion to cm
The figsize
tuple accepts inches, so if you want to set it in centimetres you have to divide them by 2.54. Have a look at this question.