ZTRTI2 - Online Linux Manual Page

Section : 1
Updated : November 2008
Source : LAPACK routine (version 3.2)
Note : LAPACK routine (version 3.2)
NAMEZTRTI2 - computes the inverse of a complex upper or lower triangular matrix
SYNOPSISSUBROUTINE ZTRTI2(  UPLO, DIAG, N, A, LDA, INFO )  CHARACTER DIAG, UPLO  INTEGER INFO, LDA, N  COMPLEX*16 A( LDA, * )
PURPOSEZTRTI2 computes the inverse of a complex upper or lower triangular matrix. This is the Level 2 BLAS version of the algorithm.
ARGUMENTSUPLO (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*16 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 0
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