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| cla_syrpvgrw.f(3) | LAPACK | cla_syrpvgrw.f(3) | 
NAME¶
cla_syrpvgrw.f -SYNOPSIS¶
Functions/Subroutines¶
REAL function cla_syrpvgrw (UPLO, N, INFO, A, LDA, AF, LDAF, IPIV, WORK)
Function/Subroutine Documentation¶
REAL function cla_syrpvgrw (character*1UPLO, integerN, integerINFO, complex, dimension( lda, * )A, integerLDA, complex, dimension( ldaf, * )AF, integerLDAF, integer, dimension( * )IPIV, real, dimension( * )WORK)¶
CLA_SYRPVGRW Purpose:CLA_SYRPVGRW 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.
UPLO
 
N
 
INFO
 
A
 
LDA
 
AF
 
LDAF
 
IPIV
 
WORK
 
Author:
          UPLO is CHARACTER*1
       = 'U':  Upper triangle of A is stored;
       = 'L':  Lower triangle of A is stored.
          N is INTEGER
     The number of linear equations, i.e., the order of the
     matrix A.  N >= 0.
          INFO is INTEGER
     The value of INFO returned from CSYTRF, .i.e., the pivot in
     column INFO is exactly 0.
          A is COMPLEX array, dimension (LDA,N)
     On entry, the N-by-N matrix A.
          LDA is INTEGER
     The leading dimension of the array A.  LDA >= max(1,N).
          AF is COMPLEX array, dimension (LDAF,N)
     The block diagonal matrix D and the multipliers used to
     obtain the factor U or L as computed by CSYTRF.
          LDAF is INTEGER
     The leading dimension of the array AF.  LDAF >= max(1,N).
          IPIV is INTEGER array, dimension (N)
     Details of the interchanges and the block structure of D
     as determined by CSYTRF.
WORK is COMPLEX array, dimension (2*N)
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
November 2011
Author¶
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