replace the elements of a matrix

Hello,

Consider a 100x1 matrix, called A, that contains random values of "0" and "1".

The number of "1" is 25 and the rest 75 are "0".

Also, consider a matrix 25x1, called B, that contains random values.

How can I replace the "1" of matrix A with the values of matrix B?

The "0" of A would not be influenced.

Thank you.

Best,

Pavlos

Answer 1

[Azzi Abdelmalek]

A(A==1)=B

[pavlos]

Thank you for your response.

Unfortunately, the above code do not work.

It works only when A and B have the same dimensions.

In my case, A is 100x1 and B is 25x1.

The number of "1" in A are 25.

[Azzi Abdelmalek]

This is not true. Look at this example

%exmple
A=zeros(100,1);
A(randperm(100,25))=1
B=rand(25,1)
%----------------------
A(A==1)=B

Answer 2

[Dishant Arora]

 A(find(A==1))=B;

[Azzi Abdelmalek]

Why to add find when you can do it without it?

[Dishant Arora]

yeah,got it