LAPACK
3.4.2
LAPACK: Linear Algebra PACKage

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Functions/Subroutines  
DOUBLE PRECISION function  zla_herpvgrw (UPLO, N, INFO, A, LDA, AF, LDAF, IPIV, WORK) 
ZLA_HERPVGRW 
DOUBLE PRECISION function zla_herpvgrw  (  character*1  UPLO, 
integer  N,  
integer  INFO,  
complex*16, dimension( lda, * )  A,  
integer  LDA,  
complex*16, dimension( ldaf, * )  AF,  
integer  LDAF,  
integer, dimension( * )  IPIV,  
double precision, dimension( * )  WORK  
) 
ZLA_HERPVGRW
Download ZLA_HERPVGRW + dependencies [TGZ] [ZIP] [TXT]ZLA_HERPVGRW computes the reciprocal pivot growth factor norm(A)/norm(U). The "max absolute element" norm is used. If this is much less than 1, the stability of the LU factorization of the (equilibrated) matrix A could be poor. This also means that the solution X, estimated condition numbers, and error bounds could be unreliable.
[in]  UPLO  UPLO is CHARACTER*1 = 'U': Upper triangle of A is stored; = 'L': Lower triangle of A is stored. 
[in]  N  N is INTEGER The number of linear equations, i.e., the order of the matrix A. N >= 0. 
[in]  INFO  INFO is INTEGER The value of INFO returned from ZHETRF, .i.e., the pivot in column INFO is exactly 0. 
[in]  A  A is COMPLEX*16 array, dimension (LDA,N) On entry, the NbyN matrix A. 
[in]  LDA  LDA is INTEGER The leading dimension of the array A. LDA >= max(1,N). 
[in]  AF  AF is COMPLEX*16 array, dimension (LDAF,N) The block diagonal matrix D and the multipliers used to obtain the factor U or L as computed by ZHETRF. 
[in]  LDAF  LDAF is INTEGER The leading dimension of the array AF. LDAF >= 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]  WORK  WORK is COMPLEX*16 array, dimension (2*N) 
Definition at line 123 of file zla_herpvgrw.f.