Specify figure size in centimeter in matplotlib

Question

I am wondering whether you can specify the size of a figure in matplotlib in centimeter. At the moment I write:

def cm2inch(value):
    return value/2.54

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Answer 1

AFIK matplotlib has no conversion functions.

If you often need to convert units, you could consider using pint. It offers also NumPy support.

For your example you could do something like the following:

from pint import UnitRegistry
ureg = UnitRegistry()

width_cm, height_cm = (12.8 * ureg.centimeter, 9.6 * ureg.centimeter)
width_inch, height_inch = (width_cm.to(ureg.inch), height_cm.to(ureg.inch))

figsize_inch = (width_inch.magnitude, height_inch.magnitude)
fig = plt.figure(figsize=figsize_inch)