How to generate a symmetric positive definite matrix?

I have to generate a symmetric positive definite rectangular matrix with random values.

Answer 1

[Elias Hasle]

What are the requirements to the distributions of the resulting random variables?

I think a crucial insight is that multiplying a matrix with its transpose will give a symmetrical square matrix.

[Andrei Bobrov]

m = 4;
ii = rand(m);
out = ii*ii.';

Answer 2

[madhan ravi]

See https://www.mathworks.com/matlabcentral/answers/123643-how-to-create-a-symmetric-random-matrix#answer_131349

symdec()

[Riccardo Canola]

Values should be random

[Andrei Bobrov]

m = 4;
ii = rand(sum(1:m),1);
out = ii(symdec(m,0));

[Bruno Luong]

Andrei your solution does not produce necessary sdp matrix (which does not meant the matrix elements are positive)

[Andrei Bobrov]

I agree with you, Bruno.