.TH "SRC/zla_syrpvgrw.f" 3 "Version 3.12.0" "LAPACK" \" -*- nroff -*-
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.SH NAME
SRC/zla_syrpvgrw.f
.SH SYNOPSIS
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.PP
.SS "Functions/Subroutines"

.in +1c
.ti -1c
.RI "double precision function \fBzla_syrpvgrw\fP (uplo, n, info, a, lda, af, ldaf, ipiv, work)"
.br
.RI "\fBZLA_SYRPVGRW\fP computes the reciprocal pivot growth factor norm(A)/norm(U) for a symmetric indefinite matrix\&. "
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.SH "Function/Subroutine Documentation"
.PP 
.SS "double precision function zla_syrpvgrw (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)"

.PP
\fBZLA_SYRPVGRW\fP computes the reciprocal pivot growth factor norm(A)/norm(U) for a symmetric indefinite matrix\&.  
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\fBPurpose:\fP
.RS 4

.PP
.nf
 ZLA_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\&.
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.RE
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\fBParameters\fP
.RS 4
\fIUPLO\fP 
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          UPLO is CHARACTER*1
       = 'U':  Upper triangle of A is stored;
       = 'L':  Lower triangle of A is stored\&.
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\fIN\fP 
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          N is INTEGER
     The number of linear equations, i\&.e\&., the order of the
     matrix A\&.  N >= 0\&.
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\fIINFO\fP 
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          INFO is INTEGER
     The value of INFO returned from ZSYTRF, \&.i\&.e\&., the pivot in
     column INFO is exactly 0\&.
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\fIA\fP 
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          A is COMPLEX*16 array, dimension (LDA,N)
     On entry, the N-by-N matrix A\&.
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\fILDA\fP 
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          LDA is INTEGER
     The leading dimension of the array A\&.  LDA >= max(1,N)\&.
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\fIAF\fP 
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          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 ZSYTRF\&.
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\fILDAF\fP 
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          LDAF is INTEGER
     The leading dimension of the array AF\&.  LDAF >= max(1,N)\&.
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\fIIPIV\fP 
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          IPIV is INTEGER array, dimension (N)
     Details of the interchanges and the block structure of D
     as determined by ZSYTRF\&.
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\fIWORK\fP 
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          WORK is DOUBLE PRECISION array, dimension (2*N)
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.RE
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\fBAuthor\fP
.RS 4
Univ\&. of Tennessee 
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Univ\&. of California Berkeley 
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Univ\&. of Colorado Denver 
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NAG Ltd\&. 
.RE
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.PP
Definition at line \fB121\fP of file \fBzla_syrpvgrw\&.f\fP\&.
.SH "Author"
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Generated automatically by Doxygen for LAPACK from the source code\&.