Shaping a vector.

I have an original vector A = [0 0 0 2 5 3 6 0 0 0 9 5 6], after performing an operation on A for which I left out the zeros, I end up with a second vector B = [ 6 9 8 3 8 7 2]. Now the number of non-zero elements in A and B are equal. I want to make a third vector C that takes the shape of vector A but populated with elements from B such that C = [0 0 0 6 9 8 3 0 0 0 8 7 2].

Answer 1

[madhan ravi]

>> A = [0 0 0 2 5 3 6 0 0 0 9 5 6]
   B = [ 6 9 8 3 8 7 2]
   idx=(A~=0);
   A(idx)=B;
   C = A

A =

       0     0     0     2     5     3     6     0     0     0     9     5     6

B =

       6     9     8     3     8     7     2

C =

       0     0     0     6     9     8     3     0     0     0     8     7     2

>>