cell array multiplication vectorization

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K.E.
K.E. 2016-11-15
回答： the cyclist 2016-11-15
I have J and K a cell array of matrices inside. I want to obtain L
J =
[18x18 double]
[18x18 double]
[18x18 double]
[18x18 double]
[18x18 double]
[18x18 double]
[18x18 double]
[18x18 double]
K =
[18x18 double]
[18x18 double]
[18x18 double]
[18x18 double]
[18x18 double]
[18x18 double]
[18x18 double]
[18x18 double]
M = magic(18);
In for loop:
L = cell(8,1);
for ii = 1:8
L{ii} = M*J{ii}'*K{ii};
end
How can I do this in a vectorized form (cell)?

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回答（1 个）

the cyclist
the cyclist 2016-11-15
This is a bit obfuscated, and I am not sure if it is an faster than a more straightforward version.
% Create some pretend data to mimic yours
M = magic(18);
for ii = 1:8
J{ii} = rand(18);
K{ii} = rand(18);
end
% Vectorized multiplication
C = cellfun(@(a,b,c)(a*b'*c),repmat({M},1,8),J,K,'UniformOutput',false);

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