.TH "TESTING/LIN/dppt01.f" 3 "Version 3.12.0" "LAPACK" \" -*- nroff -*-
.ad l
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.SH NAME
TESTING/LIN/dppt01.f
.SH SYNOPSIS
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.PP
.SS "Functions/Subroutines"

.in +1c
.ti -1c
.RI "subroutine \fBdppt01\fP (uplo, n, a, afac, rwork, resid)"
.br
.RI "\fBDPPT01\fP "
.in -1c
.SH "Function/Subroutine Documentation"
.PP 
.SS "subroutine dppt01 (character uplo, integer n, double precision, dimension( * ) a, double precision, dimension( * ) afac, double precision, dimension( * ) rwork, double precision resid)"

.PP
\fBDPPT01\fP 
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\fBPurpose:\fP
.RS 4

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.nf
!>
!> DPPT01 reconstructs a symmetric positive definite packed matrix A
!> from its L*L' or U'*U factorization and computes the residual
!>    norm( L*L' - A ) / ( N * norm(A) * EPS ) or
!>    norm( U'*U - A ) / ( N * norm(A) * EPS ),
!> where EPS is the machine epsilon\&.
!> 
.fi
.PP
 
.RE
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\fBParameters\fP
.RS 4
\fIUPLO\fP 
.PP
.nf
!>          UPLO is CHARACTER*1
!>          Specifies whether the upper or lower triangular part of the
!>          symmetric matrix A is stored:
!>          = 'U':  Upper triangular
!>          = 'L':  Lower triangular
!> 
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\fIN\fP 
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.nf
!>          N is INTEGER
!>          The number of rows and columns of the matrix A\&.  N >= 0\&.
!> 
.fi
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\fIA\fP 
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.nf
!>          A is DOUBLE PRECISION array, dimension (N*(N+1)/2)
!>          The original symmetric matrix A, stored as a packed
!>          triangular matrix\&.
!> 
.fi
.PP
.br
\fIAFAC\fP 
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.nf
!>          AFAC is DOUBLE PRECISION array, dimension (N*(N+1)/2)
!>          On entry, the factor L or U from the L*L' or U'*U
!>          factorization of A, stored as a packed triangular matrix\&.
!>          Overwritten with the reconstructed matrix, and then with the
!>          difference L*L' - A (or U'*U - A)\&.
!> 
.fi
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.br
\fIRWORK\fP 
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.nf
!>          RWORK is DOUBLE PRECISION array, dimension (N)
!> 
.fi
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.br
\fIRESID\fP 
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.nf
!>          RESID is DOUBLE PRECISION
!>          If UPLO = 'L', norm(L*L' - A) / ( N * norm(A) * EPS )
!>          If UPLO = 'U', norm(U'*U - A) / ( N * norm(A) * EPS )
!> 
.fi
.PP
 
.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 

.PP
NAG Ltd\&. 
.RE
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Definition at line \fB92\fP of file \fBdppt01\&.f\fP\&.
.SH "Author"
.PP 
Generated automatically by Doxygen for LAPACK from the source code\&.