LAPACK  3.4.0
LAPACK: Linear Algebra PACKage
Functions/Subroutines
zhetrs2.f File Reference

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Functions/Subroutines

subroutine ZHETRS2 (UPLO, N, NRHS, A, LDA, IPIV, B, LDB, WORK, INFO)
 ZHETRS2

Function/Subroutine Documentation

subroutine ZHETRS2 ( CHARACTER  UPLO,
INTEGER  N,
INTEGER  NRHS,
COMPLEX*16, dimension( lda, * )  A,
INTEGER  LDA,
INTEGER, dimension( * )  IPIV,
COMPLEX*16, dimension( ldb, * )  B,
INTEGER  LDB,
COMPLEX*16, dimension( * )  WORK,
INTEGER  INFO 
)

ZHETRS2

Download ZHETRS2 + dependencies [TGZ] [ZIP] [TXT]
Purpose: 

 ZHETRS2 solves a system of linear equations A*X = B with a complex
 Hermitian matrix A using the factorization A = U*D*U**H or
 A = L*D*L**H computed by ZHETRF and converted by ZSYCONV.
Parameters:
[in]UPLO
          UPLO is CHARACTER*1
          Specifies whether the details of the factorization are stored
          as an upper or lower triangular matrix.
          = 'U':  Upper triangular, form is A = U*D*U**H;
          = 'L':  Lower triangular, form is A = L*D*L**H.
[in]N
          N is INTEGER
          The order of the matrix A.  N >= 0.
[in]NRHS
          NRHS is INTEGER
          The number of right hand sides, i.e., the number of columns
          of the matrix B.  NRHS >= 0.
[in]A
          A is COMPLEX*16 array, dimension (LDA,N)
          The block diagonal matrix D and the multipliers used to
          obtain the factor U or L as computed by ZHETRF.
[in]LDA
          LDA is INTEGER
          The leading dimension of the array A.  LDA >= max(1,N).
[in]IPIV
          IPIV is INTEGER array, dimension (N)
          Details of the interchanges and the block structure of D
          as determined by ZHETRF.
[in,out]B
          B is COMPLEX*16 array, dimension (LDB,NRHS)
          On entry, the right hand side matrix B.
          On exit, the solution matrix X.
[in]LDB
          LDB is INTEGER
          The leading dimension of the array B.  LDB >= max(1,N).
[out]WORK
          WORK is REAL array, dimension (N)
[out]INFO
          INFO is INTEGER
          = 0:  successful exit
          < 0:  if INFO = -i, the i-th argument had an illegal value
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
November 2011

Definition at line 127 of file zhetrs2.f.

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