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

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Christina 2015-4-29

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评论： Stephen23 2015-4-29

采纳的回答： Thorsten

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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Thorsten 2015-4-29

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编辑：Thorsten 2015-4-29

在 MATLAB Online 中打开

source(source == 1) = a

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Christina 2015-4-29

Thank you! It works!

pfb 2015-4-29

However, that changes "source" instead of creating "b", as asked in the question.

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pfb 2015-4-29

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在 MATLAB Online 中打开

 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.

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Christina 2015-4-29

Thank you! It works

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Stephen23 2015-4-29

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编辑：Stephen23 2015-4-29

在 MATLAB Online 中打开

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 2015-4-29

Stephen switched nomenclature. His starting "A" is your "source" his "B" is your "a", and his resulting "A" is your "b".

Stephen23 2015-4-29

Guilty as charged.

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