lu (Matlab function) LU matrix factorization

## Matlab/Scilab equivalent

Matlab | Scilab
    [L,U] = lu(A)
    [L,U,P] = lu(A)
    [L,U,P] = lu(A,outputForm)
    [L,U,P,Q] = lu(S)
    [L,U,P,Q,D] = lu(S)
    [___] = lu(S,thresh)
    [___] = lu(___,outputForm)
    [L,U] = lu(A)
    [L,U,P] = lu(A)
    // No equivalent
    // No equivalent
    // No equivalent
    // No equivalent
    // No equivalent