How do I get rid of positive or negative values in a cell array?

How do I create a cell array that consists of only positive or negative values of another cell array in a for loop?

For example, C is a cell 1x24 cell array consisting of 16x7 matrices. First, I need to get rid of the positive numbers in those matrices, second I need to turn the negative values into positives.

I hope I was clear.

Thanks.

[KSSV]

You want to get rid? That means you want to replace them or remove them? If you remove them then you will not get a matrix, the result would be a vector..what you want ?

[Yerzhigit Bapin]

I want to replace them with zeros.

Answer 1

[Jan]

for iC = 1:numel(C)
  M        = C{iC};
  M(M > 0) = 0;
  C{iC}    = -M;
end

[Anthony Castellano]

There's no way to do it without that for loop, huh?