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Is there a better to multiply matrices with is pattern?

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John
John 2013-3-9
I have a 2 x 2 matrix A = [1 2; 3 4] and a 100 x 1 column vector B = [1 2 3 4 5 6 . . . 100]' and I want to multiply matrix A with each 2x1 sub-vector of B.
For example : [1 2; 3 4] * [1 2]
[1 2; 3 4] * [3 4]
[1 2; 3 4] * [5 6]
.
.
.
[1 2; 3 4] * [99 100]
How can I do this efficiently in code and store the results into one column vector?

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采纳的回答

Cedric
Cedric 2013-3-9
Just
C = A * reshape(B, 2, []) ;
will produce a 2x50 C matrix whose columns are the 50 solutions.

更多回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-3-9
编辑：Azzi Abdelmalek 2013-3-9
Example
A=rand(2)
B=rand(1000,1)
B=reshape(B,2,[])
out=arrayfun(@(x) A*B(:,x),1:size(B,2),'un',0)
% You can get the result as one matrix
out=cell2mpat(out)

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