How to make all negative values in a matrix 0?

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Pleuni Kirch
Pleuni Kirch 2020-11-18
编辑： cr 2020-11-19
for i= 1: size(A,1)
if A (i, 2) <= 0
DataNew(i,2) = 0
This is what I have now, but there are still negative values in my DataNew matrix
  1 个评论
Pleuni Kirch
Pleuni Kirch 2020-11-18
I am sorry I dont know how to change my question, but I only want to make the negative values of a certain column 0. Not all negative values in the matrix

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采纳的回答

cr
cr 2020-11-18
编辑：cr 2020-11-19
%% Set all negative elements to 0
A(A<0) = 0;
%% Set second column elements to 0
col = 2;
a(a(:,col)<0,col) = 0;

更多回答（2 个）

Walter Roberson
Walter Roberson 2020-11-18
A(:, 2) = max(0, A(:, 2))
Andrew Flewellen-Gore
To set set negative values in a certain column of matrix "A" to 0, you can do this:
For this example we assume A is a 2-D number matrix and that we are getting rid of negative values in the 2nd column.
>>A(:,2) = max( A(:,2), 0 )
This line of code replaces each negative number in the second collumn with 0. Each positive number in the second collumn will stay the same.

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