How do you turn values in column A to NaN if values in column B are zero?

If column B is 0 turn column 1 to nan

So, it would turn something like this:

[37370    1
    37421    0
    25021    1
    63453    1
    25467    0
    36511    0
    37341    1
    50508    0
    28250    1]

Into this:

    [37370    1
    nan        0
    25021    1
    63453    1
    nan        0
    nan        0
    37341    1
    nan        0
    28250    1]

Answer 1

[Image Analyst]

% If A and B are separate column vector variables:
A(B==0) = nan;
% or for an N-by-2 matrix m
rowsToChange = m(:, 2) == 0;
m(rowsToChange, 1) = nan;

[Matthew Brown]

Thank you.