Matplotlib协调. sys原点到左上方 [英] Matplotlib coord. sys origin to top left

问题描述

如何将matplotlib图的原点翻转到左上角-而不是默认的左下角?我正在使用matplotlib.pylab.plot生成绘图(尽管如果有另一个更灵活的绘图例程，请告诉我).

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 (though if there is another plotting routine that is more flexible, please let me know).

我正在寻找与matlab命令等效的命令:axis ij;

I'm looking for the equivalent of the matlab command: axis ij;

此外，我花了几个小时浏览matplotlib帮助和google，但没有找到答案.一些有关我可以在哪里查找答案的信息也会有所帮助.

Also, I've spent a couple hours surfing matplotlib help and google but haven't come up with an answer. Some info on where I could have looked up the answer would be helpful as well.

推荐答案

对于图像或轮廓图，可以使用关键字origin = None | 'lower' | 'upper'；对于线图，可以将ylimit设置为高到低.

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()

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