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LAPACK version 3.0
strtri(3)

PURPOSE
  STRTRI - compute the inverse of a real upper or lower triangular matrix A

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

      CHARACTER	     DIAG, UPLO

      INTEGER	     INFO, LDA, N

      REAL	     A( LDA, * )

DESCRIPTION
  STRTRI computes the inverse of a real upper or lower triangular matrix A.
  This is the Level 3 BLAS version of the algorithm.

ARGUMENTS
  UPLO	  (input) CHARACTER*1
	  = 'U':  A is upper triangular;
	  = 'L':  A is lower triangular.

  DIAG	  (input) CHARACTER*1
	  = 'N':  A is non-unit triangular;
	  = 'U':  A is unit triangular.

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

  A	  (input/output) REAL 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 = -i, the i-th argument had an illegal value
	  > 0: if INFO = i, A(i,i) is exactly zero.  The triangular matrix is
	  singular and its inverse can not be computed.