`ztrtri:`procedureThese 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.