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LAPACK version 3.0
ctrti2(3)

PURPOSE
  CTRTI2 - compute the inverse of a complex upper or lower triangular matrix

SYNTAX
  SUBROUTINE CTRTI2( UPLO, DIAG, N, A, LDA, INFO )

      CHARACTER	     DIAG, UPLO

      INTEGER	     INFO, LDA, N

      COMPLEX	     A( LDA, * )

DESCRIPTION
  CTRTI2 computes the inverse of a complex upper or lower triangular matrix.
  This is the Level 2 BLAS version of the algorithm.

ARGUMENTS
  UPLO	  (input) CHARACTER*1
	  Specifies whether the matrix A is upper or lower triangular.	=
	  'U':	Upper triangular
	  = 'L':  Lower triangular

  DIAG	  (input) CHARACTER*1
	  Specifies whether or not the matrix A is unit triangular.  = 'N':
	  Non-unit triangular
	  = 'U':  Unit triangular

  N	  (input) INTEGER
	  The order of the matrix A.  N >= 0.

  A	  (input/output) COMPLEX array, dimension (LDA,N)
	  On entry, the triangular matrix A.  If UPLO = 'U', the leading n by
	  n upper triangular part of the array A contains the upper
	  triangular matrix, and the strictly lower triangular part of A is
	  not referenced.  If UPLO = 'L', the leading n by n lower triangular
	  part of the array A contains the lower triangular matrix, and the
	  strictly upper triangular part of A is not referenced.  If DIAG =
	  'U', the diagonal elements of A are also not referenced and are
	  assumed to be 1.

	  On exit, the (triangular) inverse of the original matrix, in the
	  same storage format.

  LDA	  (input) INTEGER
	  The leading dimension of the array A.	 LDA >= max(1,N).

  INFO	  (output) INTEGER
	  = 0: successful exit
	  < 0: if INFO = -k, the k-th argument had an illegal value