在Matlab中使用`spy`为不同的数字获取不同的颜色 [英] Getting different colors for different numbers using `spy` in Matlab

问题描述

当我使用间谍检查稀疏模式时，它无法将某些元素与其他元素区分开.有什么办法吗?举例来说，等于10的元素为红色，而等于9的所有元素为蓝色.我可以在一个spy图中得到它吗?

When I use spy to check a sparsity pattern, it doesn't distinguish certain elements from others. Is there any way to do this? Say, for example, elements that are equal to 10 are red and all elements equal to 9 are blue. Can I get this in one spy plot?

我只能更改绘图点的大小和样式.

I've only been able to change the size and style of the plot points.

推荐答案

以下是您的操作方法:

spy(a,'k')
hold on
spy(a==10,'r')
spy(a==9,'b')
hold off

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另一种方法是使用scatter而不是spy:

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Another way is to use scatter instead of spy :

[x,y] = find(a);
clr = a(a~=0);
scatter(x,y,[],clr)
set(gca,'YDir','rev')

在这种情况下，这些点将根据当前图形的颜色图以a值进行着色.

In this case the points will be colored by a values according to current figure colormap.

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