help understanding simple Vectorization

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salamay
salamay 2011-8-6
Hi,
I am new to vectorization and would appreciate if someone could help me vectorize the following;
for i = 1: length(A)
idx = A(i,1);
C(i) = A(i,1)*B(idx);
end
  1 个评论
Fangjun Jiang
Fangjun Jiang 2011-8-6
Please provide an example data. Sometimes the size (of the data) does matter.

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采纳的回答

Fangjun Jiang
Fangjun Jiang 2011-8-6
C=A(:,1).*B(A(:,1))
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Paulo Silva
Paulo Silva 2011-8-6
I tried and it gave the same result as your code, like Fangjun said you should provide one example for us to test.
salamay
salamay 2011-8-6
im sorry it works
my syntax was wrong
example
A = [1 2; 1 3; 1 6; 2 2; 2 6; 3 9]
B = [2 5 9]

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