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# hi every one, i need to ask a question, thank you

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mina massoud on 30 Jun 2019
Commented: mina massoud on 1 Jul 2019
if i have a row vector like this A=[ 0 1 1 1 0 0 1 1 0 1 ]
and another vector B=[ 1 2 3 4 5 6 ]
and i need to put the element of B in order in A when the element is equal to 1
so if it can possibile i need to return a vector with the dimensions of B like this [ 0 1 2 3 0 0 4 5 0 6 ] , how can i do it if it's possibile to do it in matlab
thank you

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### Accepted Answer

Image Analyst on 30 Jun 2019
Try this:
A=[ 0 1 1 1 0 0 1 1 0 1 ]
B=[ 1 2 3 4 5 6 ]
out = A % Initialize
out(logical(A)) = B % Assign B to "1" locations in A
It give you what you asked for.

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### More Answers (3)

Matt J on 30 Jun 2019
Edited: Matt J on 30 Jun 2019
result=sparse(1,find(A),B)

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Catalytic on 30 Jun 2019
A=double(A);
A(logical(A))=B;

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Matt J on 30 Jun 2019
Edited: Matt J on 1 Jul 2019
[i,j]=find(A(:));
result=accumarray([i,j],B(:),size(A.')).'

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Matt J on 1 Jul 2019
I've debugged the accumarray solution, though I'm not sure why it was preferred over this one. That was the first answer offered and works straight out of the box.
Image Analyst on 1 Jul 2019
I think it's because the poster did not see what she wanted to see. So instead of seeing:
0 1 2 3 0 0 4 5 0 6
like she asked for, you see
result =
(1,2) 1
(1,3) 2
(1,4) 3
(1,7) 4
(1,8) 5
(1,10) 6
mina massoud on 1 Jul 2019
sorry i accept it by mistake , now i accept your answer that is the best answer
thank's very much for all of you, i really appraciate it

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