Build determinantes of matrices in cell arrays
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I have a cell array X with dimension (N x 2) and N is an even number. This cell array is filled with (2 x 2) Matrices of type double.
I'm wondering, if there is a way to build the determinants of each of those matrices (type: double) in a vectorized manner without using a for loop.
My solution was:
Y = zeros(N,1)
for i = 1:N
Y = det(X{i});
end
Now I have this Y of size (N x 1), which will contain all the determinants of the (2 x 2) matrices stored in the cell array X with size (N x 2).
Can I "vectorize" the for loop in some way or the other?
Thanks for having a look at this!
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Accepted Answer
KSSV
on 19 Apr 2017
doc cellfun
N = 4 ;
X = cell(N,2) ;
for i = 1:N
X{i,1} = rand(2) ;
X{i,2} = rand(2) ;
end
detX = cellfun(@det,X) ;
5 Comments
Jan
on 19 Apr 2017
While the cellfun method is nice, it is not "vectorized" actually. You only do not see the loop anymore. Internally you cannot treat the cell elements in a vectorized way.
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