I have the m-by-n matrix POS
I want to focus on a single column and perform an element-wise logical operation. For instance, turning all zero's to ones:
However, this does nothing. On the other hand, this works on the whole matrix:
But, obviously, I just want to perform this operation on column 2. What am I missing? I do not want another line of code since speed is very important here.
Even more confusing, the following works on the first column, but not on the second: