How to transform a vector to a matrix with same position ?

Question

Safia 2022-10-29

评论： Safia 2022-10-30

Hello everyone!

i want to ask you, if i have a matrix A in each row i have only one value , the rest are set to zero.Also i have a column vector V.

V =sum(A,2) but with removed elements.

I want to replace the value in A by the value in V at the same positions.

this is an example :

A=[100  0   0   0   0   0
 50  0   0   0   0
 0   0   20  0   0
 0   0   0   30  0
 0   0   0   0   80]

here the removed element in row 2 (50).

So V is the follow:

Now i want to replace A by elements in V.

the required result is :

A1=[100  0   0   0   0   0
 0   0   20   0    0
 0   0    0    30   0
 0   0    0    0   80]

How can i do that?

Answer 1

Matt J 2022-10-30

A=A( ismember(sum(A,2),V) ,:)

Safia 2022-10-30

Thank you so much