- ztrtri:procedure
These routines compute the inverse of a triangular matrix A. Argument A is the triangular factor U or L as computed by xPOTRF. Argument UPLO indicates whether upper or lower triangle of A is stored (Upper or Lower). Argument DIAG indicates whether A is non-unit triangular or unit triangular (NonUnit or Unit). Optional argument LDA is the leading dimension of array A. The return value is the triangular inverse of the input matrix, in the same storage format.