.TH "zla_porpvgrw.f" 3 "Tue Nov 14 2017" "Version 3.8.0" "LAPACK" \" -*- nroff -*-
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.SH NAME
zla_porpvgrw.f
.SH SYNOPSIS
.br
.PP
.SS "Functions/Subroutines"

.in +1c
.ti -1c
.RI "double precision function \fBzla_porpvgrw\fP (UPLO, NCOLS, A, \fBLDA\fP, AF, LDAF, WORK)"
.br
.RI "\fBZLA_PORPVGRW\fP computes the reciprocal pivot growth factor norm(A)/norm(U) for a symmetric or Hermitian positive-definite matrix\&. "
.in -1c
.SH "Function/Subroutine Documentation"
.PP 
.SS "double precision function zla_porpvgrw (character*1 UPLO, integer NCOLS, complex*16, dimension( lda, * ) A, integer LDA, complex*16, dimension( ldaf, * ) AF, integer LDAF, double precision, dimension( * ) WORK)"

.PP
\fBZLA_PORPVGRW\fP computes the reciprocal pivot growth factor norm(A)/norm(U) for a symmetric or Hermitian positive-definite matrix\&.  
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\fBPurpose: \fP
.RS 4

.PP
.nf
 ZLA_PORPVGRW 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.
.fi
.PP
 
.RE
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\fBParameters:\fP
.RS 4
\fIUPLO\fP 
.PP
.nf
          UPLO is CHARACTER*1
       = 'U':  Upper triangle of A is stored;
       = 'L':  Lower triangle of A is stored.
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\fINCOLS\fP 
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          NCOLS is INTEGER
     The number of columns of the matrix A. NCOLS >= 0.
.fi
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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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.br
\fIAF\fP 
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          AF is COMPLEX*16 array, dimension (LDAF,N)
     The triangular factor U or L from the Cholesky factorization
     A = U**T*U or A = L*L**T, as computed by ZPOTRF.
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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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.br
\fIWORK\fP 
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.nf
          WORK is DOUBLE PRECISION array, dimension (2*N)
.fi
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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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\fBDate:\fP
.RS 4
June 2016 
.RE
.PP

.PP
Definition at line 109 of file zla_porpvgrw\&.f\&.
.SH "Author"
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Generated automatically by Doxygen for LAPACK from the source code\&.
