Thread Subject:

"or" many same size logical arrays together

I have an NxM cell array. Each cell contains a UxV logical array (same U and same V throughout). How can I "or" all the N*M logical arrays together, to get a UxV answer?
Can I do it in one line? Perhaps I should use "max", but I don't see how.

On 3/29/2012 9:02 AM, David Epstein wrote:
> I have an NxM cell array. Each cell contains a UxV logical array (same U
> and same V throughout). How can I "or" all the N*M logical arrays
> together, to get a UxV answer?
> Can I do it in one line? Perhaps I should use "max", but I don't see how.

Starting with the cell array,

c = cell(N,M);
% Fill cell array with UxV logical arrays.

You could put the cells together in a 3-D array and then use any:

result = any(cat(3,c{:}),3);

but that builds an intermediate matrix with NxMxUxV elements so if that
is large you might want to use a loop:

result = false(U,V);
for i = 1:N*M
     result = result | c{i};
end


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Doug Schwarz
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