How to make all negative values in a matrix 0?

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

[Pleuni Kirch]

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

Answer 1

[cr]

%% Set all negative elements to 0
A(A<0) = 0; 
%% Set second column elements to 0
col = 2;
a(a(:,col)<0,col) = 0;

[madhan ravi]

A(A(:, 2) < 0 , 2) = 0

Answer 2

[Walter Roberson]

A(:, 2) = max(0, A(:, 2))

Answer 3

[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.