How to create a symetric matrix with a vector?

Hello everyone,

I would like to know how I can create a symetric matrix only with a vector. Per example:

v=[1 2 3 4 5]

And the result that I would like to obtain:

A = [1 2 3 4 5; 2 2 3 4 5; 3 3 3 4 5; 4 4 4 4 5; 5 5 5 5 5]

I hope that it could be understand well.

I have been searching and I have found the Toeplitz matrix but it doesn't resolves my problem.

Thanks in advance

Answer 1

[Stephen23]

A general solution using indexing:

V = [1,2,3,4,5]

V = 1×5

1 2 3 4 5

X = 1:numel(V);
M = V(max(X,X.'))

M = 5×5

1 2 3 4 5 2 2 3 4 5 3 3 3 4 5 4 4 4 4 5 5 5 5 5 5

[Javier Fuster]

Thank you very much! It works perfectly