如何更改矩阵中多个点的值？ [英] How can I change the values of multiple points in a matrix?

问题描述

我有一个[500x500]的矩阵。我有另一个[2x100]矩阵，它包含可能在第一个矩阵内的坐标对。我希望能够将第一个矩阵的所有值更改为零，而不需要循环。

I have a matrix that is [500x500]. I have another matrix that is [2x100] that contains coordinate pairs that could be inside the first matrix. I would like to be able to change all the values of the first matrix to zero, without a loop.

mtx = magic(500);
co_ords = [30,50,70;  30,50,70];
mtx(co_ords) = 0;

推荐答案

您可以使用函数 SUB2IND 将您的下标对转换为线性索引：

You can do this using the function SUB2IND to convert your pairs of subscripts into a linear index:

mtx(sub2ind(size(mtx),co_ords(1,:),co_ords(2,:))) = 0;

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