# How do I multiply matrices having elements as vectors?

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Sameer 2015년 6월 2일
A*B doesn't work A.*B doesn't work either since it multiplies them element by element
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Sameer 2015년 6월 2일
편집: Sameer 2015년 6월 2일
a=1:1000;
A=[a 2*a;a 2*a];
B=[2*a a;a a];
C=A*B %Error using *
%Inner matrix dimensions must agree.
D= A.*B % multiplies element by element which I don't want
So what is your expected result?

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### 답변 (1개)

Matthew Eicholtz 2015년 6월 2일
If I understand the question correctly, you are asking how to multiply two vectors of the same size.
Without loss of generality, let's assume A and B are 1x10 vectors. A*B will not work because the inner dimensions do not match (1x10 * 1x10). A.*B will only multiply each pair of elements as you noticed, yielding a 1x10 result.
Two potential solutions:
1. dot(A,B)
2. A*B'

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