Matlab逐元素除以零 [英] Matlab element-wise division by zero

问题描述

我有两个矩阵，比如X = [1 2; 3 4; 5 6]，且Y = [0 1; -1 1; 1 1].我想执行按元素除法X./Y，但是我需要一种忽略Y中所有零的方法.

I have two matrices, say X = [1 2; 3 4; 5 6] and Y = [0 1; -1 1; 1 1]. I want to perform element-wise division X./Y, but I need a way to ignore all the zeros in Y.

我尝试使用类似的东西:

I tried using something like:

nonzeros = find(Y〜= 0); X(非零)./Y(非零);

nonzeros = find(Y ~= 0); X(nonzeros) ./ Y(nonzeros);

但是这样做会使结果成为列向量，并且我需要结果矩阵的形状与X(或Y)相同，并且Y为零时为零.因此，在这种情况下，我希望得到的结果是[0 2; -3 4; 5 6].

but doing so caused the result to be a column vector, and I need the shape of the result matrix to be the same as X (or Y) and with zeros where Y was zero. So my desired result for this case is [0 2; -3 4; 5 6].

我还尝试了此处的建议(右数组除法:忽略除法零)，但再次执行此操作将强制结果为列向量.

I also tried what was suggested here (Right Array Division : Ignoring division by zeroes), but doing this again forces the result to be a column vector.

谢谢

推荐答案

使用此-

out = X./Y      %// Perform the elementwise division
out(Y==0)=0     %// Select the positions where Y is zero and 
                %// set those positions in the output to zero

输出-

X =
     1     2
     3     4
     5     6
Y =
     0     1
    -1     1
     1     1
out =
     0     2
    -3     4
     5     6

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