Store value in Matrix

Hello,

I want to store the value in the matrix form using for loop.

For example: Let's say I have a matrix A (2*2 matrix)

A = [1 2;
     3 4]

But the output should be:

A = [1 0 0 0
     1 2 0 0
     1 2 3 0
     1 2 3 4]

Can somebody tell me how to do this?

Thank you very much!

Answer 1

[Star Strider]

One approach:

A = [1 2;
     3 4];
A = A';
B = repmat(A(:)',numel(A),1);
Result = tril(B)

Result =
     1     0     0     0
     1     2     0     0
     1     2     3     0
     1     2     3     4

[Mystery Devil]

Thank you very much! This is how I wanted. It worked!

[Star Strider]

My pleasure!

Answer 2

[Andrei Bobrov]

A = [1 2;
     3 4];

out = tril(ones(numel(A),1)*reshape(A.',1,[]));

[Mystery Devil]

Thank you very much!