Matplotlib coord. sys origin to top left

Question

How can I flip the origin of a matplotlib plot to be in the upper-left corner - as opposed to the default lower-left? I\'m using matplotlib.pylab.plot to produce the plot (

Answer 1

For an image or contour plot, you can use the keyword origin = None | 'lower' | 'upper' and for a line plot, you can set the ylimits high to low.

from pylab import *
A = arange(25)/25.
A = A.reshape((5,5))

figure()
imshow(A, interpolation='nearest', origin='lower')

figure()
imshow(A, interpolation='nearest')

d = arange(5)
figure()
plot(d)
ylim(5, 0)

show()