(S|D|C|Z)TRTI2
==============
Single, double, single complex, and double complex TRTI2.

Description
-----------
Computes the inverse of a triangular matrix using an unblocked algorithm.

If UPLO is 'U' then A is assumed to be upper triangular and the lower
triangular part is not accessed.

If UPLO is 'L' then A is assumed to be lower triangular and the upper
triangular part is not accessed.

If DIAG is 'U' then the diagonal of A is not accessed and is assumed
to be 1. If Diag is 'N' then the diagonal of A is accessed.


LAPACK Interface
----------------
.. code-block:: c

    void strti2(const char *UPLO, const char *DIAG, const qml_long *N, float *A,
        const qml_long *LDA, qml_long *INFO);

    void dtrti2(const char *UPLO, const char *DIAG, const qml_long *N, double *A,
        const qml_long *LDA, qml_long *INFO);

    void ctrti2(const char *UPLO, const char *DIAG, const qml_long *N,
        qml_single_complex *A, const qml_long *LDA, qml_long *INFO);

    void ztrti2(const char *UPLO, const char *DIAG, const qml_long *N,
        qml_double_complex *A, const qml_long *LDA, qml_long *INFO);


Arguments
---------
======   =====================================================================
UPLO     Specify whether to use 'U' upper triangular or 'L' lower triangular part of A
DIAG     Specify whether to assume 'N' non-unit triangular or 'U' unit triangular
N        Order of the matrix A
A        Matrix of size N x N, overwritten with inverse on exit
LDA      Leading dimension of A
INFO     0 on success, <0 on illegal arguments
======   =====================================================================
