避免在MATLAB中矩阵之间被零除 [英] Avoid division by zero between matrices in MATLAB

问题描述

我正在使用matlab，并且有两个矩阵:

I'm using matlab and I have two matrices :

G =

 1     1     1     1
 1     1     1     1

和第二个:

m =

 4     4     4     4
 0     0     0     0

我想要这个结果:

x =

 1/4     1/4     1/4     1/4
  0       0       0       0

到目前为止，我所做的是:

What I did so far is this :

x = G ./ m

但是它返回:

x =

 1/4     1/4     1/4     1/4
 NaN     NaN     NaN     NaN

如果除以零，我如何放置默认值"0"来避免除以零?

How can I avoid the divison by zero by placing a default value "0" if there is a division by zero ?

推荐答案

您可以将NaN转换回零:

You can convert the NaNs back to zero:

x = G ./ m;
x(isnan(x))=0;      % thanks to comment by @nkjt

或者，如果在矩阵m中也要保存NaN，则可以执行以下操作:

Or, if you have also NaNs in matrix m that you want to save, you can do:

x(m==0)=0;

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