matrix multiplication using bsxfun(@times,a,b)

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summyia qamar
summyia qamar 2016-12-15
回答： John D'Errico 2016-12-15
a=[1 0 0 1 0 1 1
0 1 1 1 0 0 1
1 0 0 1 1 0 0
1 0 0 0 1 0 1
1 1 0 0 0 1 0
0 1 0 0 0 1 1]
b=[0 1 0
0 1 0
1 0 0
0 0 1
0 0 1
0 0 1
0 0 1]
c=bsxfun(@times,a,b)
but it is giving error
Error using bsxfun
Non-singleton dimensions of the two input arrays must match each other.
how to multiply (6x7) matrix with (7x3) to get a matrix(6x3)

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采纳的回答

James Tursa
James Tursa 2016-12-15
编辑：James Tursa 2016-12-15
Not sure if this is the operation you really want from your description:
a = 6x7 matrix
b = 7x3 matrix
c = a * b; % 6x3 matrix

更多回答（2 个）

David Barry
David Barry 2016-12-15
The issue is because both a and b are vectors rather than matrices in the example you have shown there. Presumably what you want is something like:
a = reshape(a, 6, 7);
b = reshape(b, 7, 3);
c = a*b;
John D'Errico
John D'Errico 2016-12-15
Neither of those matrices is either 6x7 or 7x3, so your question is nonsense as written.
Perhaps your intention is that these VECTORS be reshaped into MATRICES of the given sizes. In that case, use reshape, then merely do a simple matrix multiply, using the * operator.
But you cannot use a tool like bsxfun to do something that only you know what you want it to do. Software simply does not work that way.

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