U is an upper triangular matrix. U T is the transpose of matrix U . U H is the conjugate transpose of matrix U . If n is 0, no computation is performed. Error Conditions Resource Errors Unable to allocate internal work area.
Processing continues to the end of the matrix.
The index i of the last nonpositive element encountered is identified in the computational error message. The return code is set to 1. Processing stops at the first occurrence of a nonpositive definite diagonal element. The order i of the first minor encountered having a nonpositive determinant is identified in the computational error message. The return code is set to 1.