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dtrtri(3P)		    Sun Performance Library		    dtrtri(3P)

NAME
       dtrtri - compute the inverse of a real upper or lower triangular matrix
       A

SYNOPSIS
       SUBROUTINE DTRTRI(UPLO, DIAG, N, A, LDA, INFO)

       CHARACTER * 1 UPLO, DIAG
       INTEGER N, LDA, INFO
       DOUBLE PRECISION A(LDA,*)

       SUBROUTINE DTRTRI_64(UPLO, DIAG, N, A, LDA, INFO)

       CHARACTER * 1 UPLO, DIAG
       INTEGER*8 N, LDA, INFO
       DOUBLE PRECISION A(LDA,*)

   F95 INTERFACE
       SUBROUTINE TRTRI(UPLO, DIAG, N, A, [LDA], [INFO])

       CHARACTER(LEN=1) :: UPLO, DIAG
       INTEGER :: N, LDA, INFO
       REAL(8), DIMENSION(:,:) :: A

       SUBROUTINE TRTRI_64(UPLO, DIAG, N, A, [LDA], [INFO])

       CHARACTER(LEN=1) :: UPLO, DIAG
       INTEGER(8) :: N, LDA, INFO
       REAL(8), DIMENSION(:,:) :: A

   C INTERFACE
       #include <sunperf.h>

       void dtrtri(char uplo, char diag,  int  n,  double  *a,	int  lda,  int
		 *info);

       void  dtrtri_64(char uplo, char diag, long n, double *a, long lda, long
		 *info);

PURPOSE
       dtrtri 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)
		 = 'U':	 A is upper triangular;
		 = 'L':	 A is lower triangular.

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

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

       A (input/output)
		 On  entry, the triangular matrix A.  If UPLO = 'U', the lead‐
		 ing 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)
		 The leading dimension of the array A.	LDA >= max(1,N).

       INFO (output)
		 = 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.

				  6 Mar 2009			    dtrtri(3P)

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