Replace some values of a vector with another vector which has a different size

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Christina
Christina 2015-4-29
评论： Stephen23 2015-4-29
Hello
I've got the vector: source = [ 0 0 1 0 1]
and the vector a = [2 3],
which has a different size to source.
I'd like to replace in the source vector the elements that are equal to 1, with those of vector a.
The final vector b should be: b = [0 0 2 0 3]
Any thoughts on this?
Thank you!

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采纳的回答

Thorsten
Thorsten 2015-4-29
编辑：Thorsten 2015-4-29
source(source == 1) = a

更多回答（2 个）

pfb
pfb 2015-4-29
b=zeros(size(source));
b(find(source))=a;
of course this works only if the number of nonzero elements in source are the same as the elements in a.
Stephen23
Stephen23 2015-4-29
编辑：Stephen23 2015-4-29
This can be achieved very simply using basic logical indexing:
>> A = [ 0 0 1 0 1];
>> B = [ 2 3];
>> A(A==1) = B
A = 0 0 2 0 3
On my computer this was almost twice as fast compared to using find and zeros.
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James Tursa
James Tursa 2015-4-29
Stephen switched nomenclature. His starting "A" is your "source" his "B" is your "a", and his resulting "A" is your "b".

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