matrix element in summation sign

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lo
lo 2014-3-10
编辑： Mischa Kim 2014-3-10
I have 2 matrix A=[a;b;c] and B=[d;e;f]
Now I want the answer of
So I type the code
syms i
symsum(A(i)*B(i),1,3)
Then there is an error "Indexing input must be numeric, logical or ':'."
But what I mean is A(1)*B(1) + A(2)*B(2) ...
So what is the correct code for this question?

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回答（1 个）

Mischa Kim
Mischa Kim 2014-3-10
编辑：Mischa Kim 2014-3-10
Lo, use
syms a b c d e f
A = [a; b; c];
B = [d; e; f];
sum(A.*B)

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