i have a matrix with 56 columns and want to replace with NaN values on a column N corresponding to positions on another column M containing values > of a threshold.
Let's say: if the i-th value of the column 56 is greater than threshold, replace the i-th value of the column N with NaN.
Logical indexing would be better.
Doing this i'm selecting the values greater than 8 on the columns, erasing the others.
R_mod=R(R(:, 56) > 8.0, :)
Thanks in advance,