映射矩阵与另一个矩阵 [英] map a matrix with another matrix

问题描述

我不得不矩阵与只包含1和0另一个矩阵映射的问题。
在这里，我的问题的例子： A 是双打矩阵

  A = [1 4 3;
      2 3 4;
      4 3 1;
      4 5 5;
      1 2 1];
 

B是用一和零的矩阵

  B = [0 0 0;
      0 0 0;
      1 1 1;
      1 1 1;
      0 0 0];
 

我要实现矩阵 C 这是结果 A 按映射乙，就像这样：

  C = [0 0 0;
      0 0 0;
      4 3 1;
      4 5 5;
      0 0 0];
 

我试过 B 作为逻辑阵列和矩阵。两者导致了同样的错误：

  

下标指标必须是真正的正整数或逻辑值。

解决方案

只需乘A和B元素明智的：

  C = A. * B
 

I have a question to the mapping of a matrix with another matrix which contains only 1 and 0. Here an example of my problem: A is the matrix with doubles

A = [ 1 4 3;
      2 3 4; 
      4 3 1; 
      4 5 5; 
      1 2 1];

B is a matrix with ones and zeros:

B = [ 0 0 0;
      0 0 0;
      1 1 1;
      1 1 1;
      0 0 0];

I want to achieve a matrix C which is the result of A mapped by B, just like that:

C = [ 0 0 0;
      0 0 0;
      4 3 1;
      4 5 5;
      0 0 0];

I tried B as a logical array and as a matrix. Both lead to the same error:

"Subscript indices must either be real positive integers or logicals."

解决方案

Just multiply A and B element-wise:

C = A.*B

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