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How to add data of 2 vectors with different size

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Jamais avenir
Jamais avenir 2015-4-18
评论： Star Strider 2015-4-18
Hi
I have 2 vectors and I want to merge them directly. A=[1;2;3;4;5] and B=zeros(17,1) where, elements of A are going to these indices [4 5 7 11 13];
A_new=[0;0;0;1;2;0;3;0;0;0;4;0;5;0;0;0;0]

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Star Strider
Star Strider 2015-4-18
One way:
B = zeros(17,1);
A = [1;2;3;4;5];
I = [4 5 7 11 13];
A_new = B;
A_new(I) = A;
  2 个评论
Jamais avenir
Jamais avenir 2015-4-18
编辑：Jamais avenir 2015-4-18
Thanks, But I want to add them directly, for example like solving this case: If I had :
aa = [1 2 3 4]; bb = [100 100]; and wanted to get this result:
cc = [101 102 3 4]
The answer could be :
cc = aa + [bb zeros(1,2)];
Is there any similar answer ?
Star Strider
Star Strider 2015-4-18
That isn’t the same as in your original Question.
You have to address them by the appropriate subscripts, and it works:
aa = [1 2 3 4];
bb = [100 100];
cc = aa;
cc(1:2) = cc(1:2) + bb;
There may be other ways, but that’s the most efficient.

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