Set vector elements of one vector to nonzero elements of another

CP
2011 4 1
2 个回答
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1 个投票

So I have two vectors:
v1, v2, both same size.
I want to find all the elements where v2 is not zero and set the corresponding elements in v1 to those values, while leaving the other elements in v1 untouched.
E.g.
v1=[1 2 3 4 5] v2=[1 0 1 1 0]
Code I need goes here
v1 --> [1 2 1 1 5]
Can I do this without loops? Thanks.

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 采纳的回答

Sean de Wolski
Sean de Wolski 2011-4-1

0 个投票

v1(logical(v2)) = v2(logical(v2));
or on two lines:
idx = logical(v2);
v1(idx) = v2(idx);

更多回答（1 个）

CP
CP 2011-4-1

0 个投票

That gives a vector of the nonzero indices (e.g. [1 3 4] in the above example), but without looping through that resulting vector how can I set them to the values I need?
Edit: Ok the edited versions work. Thanks :)

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