replacing all numbers in a certain row

Question

David Hindahl 2018-5-3

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https://ww2.mathworks.cn/matlabcentral/answers/398796-replacing-all-numbers-in-a-certain-row

回答： David Hindahl 2018-5-3

Hi Guys Is there a way to replace all values in a row if just one value in the row meet a condition. Given a random 5x5 matrix. my condition is, if one number in a row is equal to -3, then all values in that row must be changed to -3.

To start with I thought that i could make a for loop, and then check each row and see if it meet the condition

Thank you in advance!

-David

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Answer 1

Stephen23 2018-5-3

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https://ww2.mathworks.cn/matlabcentral/answers/398796-replacing-all-numbers-in-a-certain-row#answer_318433

编辑：Stephen23 2018-5-3

在 MATLAB Online 中打开

Where M is your matrix:

M(any(M==-3,2),:) = -3

For example:

>> M = randi(9,5);
>> M(4,2) = -3
M =
   5   2   5   1   7
   2   3   5   8   3
   6   3   4   9   5
   8  -3   9   7   2
   5   6   8   8   9
>> M(any(M==-3,2),:) = -3
M =
   5   2   5   1   7
   2   3   5   8   3
   6   3   4   9   5
  -3  -3  -3  -3  -3
   5   6   8   8   9