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---
:name: dtrtri
:md5sum: 8441a50f1dc21d4959daa59006cdb017
:category: :subroutine
:arguments:
- uplo:
:type: char
:intent: input
- diag:
:type: char
:intent: input
- n:
:type: integer
:intent: input
- a:
:type: doublereal
:intent: input/output
:dims:
- lda
- n
- lda:
:type: integer
:intent: input
- info:
:type: integer
:intent: output
:substitutions: {}
:fortran_help: " SUBROUTINE DTRTRI( UPLO, DIAG, N, A, LDA, INFO )\n\n\
* Purpose\n\
* =======\n\
*\n\
* DTRTRI computes the inverse of a real upper or lower triangular\n\
* matrix A.\n\
*\n\
* This is the Level 3 BLAS version of the algorithm.\n\
*\n\n\
* Arguments\n\
* =========\n\
*\n\
* UPLO (input) CHARACTER*1\n\
* = 'U': A is upper triangular;\n\
* = 'L': A is lower triangular.\n\
*\n\
* DIAG (input) CHARACTER*1\n\
* = 'N': A is non-unit triangular;\n\
* = 'U': A is unit triangular.\n\
*\n\
* N (input) INTEGER\n\
* The order of the matrix A. N >= 0.\n\
*\n\
* A (input/output) DOUBLE PRECISION array, dimension (LDA,N)\n\
* On entry, the triangular matrix A. If UPLO = 'U', the\n\
* leading N-by-N upper triangular part of the array A contains\n\
* the upper triangular matrix, and the strictly lower\n\
* triangular part of A is not referenced. If UPLO = 'L', the\n\
* leading N-by-N lower triangular part of the array A contains\n\
* the lower triangular matrix, and the strictly upper\n\
* triangular part of A is not referenced. If DIAG = 'U', the\n\
* diagonal elements of A are also not referenced and are\n\
* assumed to be 1.\n\
* On exit, the (triangular) inverse of the original matrix, in\n\
* the same storage format.\n\
*\n\
* LDA (input) INTEGER\n\
* The leading dimension of the array A. LDA >= max(1,N).\n\
*\n\
* INFO (output) INTEGER\n\
* = 0: successful exit\n\
* < 0: if INFO = -i, the i-th argument had an illegal value\n\
* > 0: if INFO = i, A(i,i) is exactly zero. The triangular\n\
* matrix is singular and its inverse can not be computed.\n\
*\n\n\
* =====================================================================\n\
*\n"
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