在此示例中，为什么pcolor输出一个镜像数组? [英] Why does pcolor output a mirrored array in this example?

问题描述

array = np.eye(5)
plt.pcolor(array)

如果要执行此代码，则输出图实际上将是已定义数组的镜像.为什么呢?

If you were to do this code, the output graph would actually be a mirror of the defined array. why is that?

推荐答案

它只是从左下角绘制的，如果您查看x& y轴上的标签，这是很有意义的.查看文档您可以将其反转:

It just draws from the bottom left, which make quite sense if you check out the labeling on the x&y-axes. Check out documentation You can invert it though:

1. 通过翻转y轴

1. by flipping the y-axis

plt.gca().invert_yaxis()

或通过更改输入矩阵(如果适用的话...)

or by changing your input matrix (if appropriate ...)

plt.pcolor(np.eye(5)[::-1，:])

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