matlab条件矩阵赋值 [英] matlab conditioned matrix assignment

问题描述

我对矩阵分配有疑问。

i have a question about matrix assignment.

说我有三个矩阵A，B和C，我想根据规则

say i have three matrices A, B and C, and i want to assign the elements of matrix C to the elements of A and B according to the rule

  C[i,j] = A[i,j] if abs(C[i,j] - A[i,j]) < abs(C[i,j] - B[i,j])
  C[i,j] = B[i,j] if abs(C[i,j] - A[i,j]) > abs(C[i,j] - B[i,j])
  C[i,j] = 0  if abs(C[i,j] - A[i,j]) == abs(C[i,j] - B[i,j])

如何在没有for循环的情况下编写它？

how can i write it without for loops?

非常感谢你的帮助。

推荐答案

我认为Dan Becker有正确的想法，但重新计算 abs（CB）和 abs（CA）意味着<比较em> updated 矩阵，而不是原始矩阵。

I think Dan Becker has the right idea, but re-computing abs(C-B) and abs(C-A) implies that the updated matrices are compared, not the original ones.

我不认为这是你想要的，所以这是他方法的更正版本：

I don't think this is what you want, so here's the corrected version of his method:

CmA = abs(C-A);
CmB = abs(C-B);

ind = Cma < CmB; C(ind) = A(ind);
ind = CmA > CmB; C(ind) = B(ind);
C(CmA == CmB) = 0;

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