.TH "TESTING/LIN/dptt01.f" 3 "Version 3.12.0" "LAPACK" \" -*- nroff -*-
.ad l
.nh
.SH NAME
TESTING/LIN/dptt01.f
.SH SYNOPSIS
.br
.PP
.SS "Functions/Subroutines"

.in +1c
.ti -1c
.RI "subroutine \fBdptt01\fP (n, d, e, df, ef, work, resid)"
.br
.RI "\fBDPTT01\fP "
.in -1c
.SH "Function/Subroutine Documentation"
.PP 
.SS "subroutine dptt01 (integer n, double precision, dimension( * ) d, double precision, dimension( * ) e, double precision, dimension( * ) df, double precision, dimension( * ) ef, double precision, dimension( * ) work, double precision resid)"

.PP
\fBDPTT01\fP 
.PP
\fBPurpose:\fP
.RS 4

.PP
.nf
!>
!> DPTT01 reconstructs a tridiagonal matrix A from its L*D*L'
!> factorization and computes the residual
!>    norm(L*D*L' - A) / ( n * norm(A) * EPS ),
!> where EPS is the machine epsilon\&.
!> 
.fi
.PP
 
.RE
.PP
\fBParameters\fP
.RS 4
\fIN\fP 
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.nf
!>          N is INTEGER
!>          The order of the matrix A\&.
!> 
.fi
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.br
\fID\fP 
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.nf
!>          D is DOUBLE PRECISION array, dimension (N)
!>          The n diagonal elements of the tridiagonal matrix A\&.
!> 
.fi
.PP
.br
\fIE\fP 
.PP
.nf
!>          E is DOUBLE PRECISION array, dimension (N-1)
!>          The (n-1) subdiagonal elements of the tridiagonal matrix A\&.
!> 
.fi
.PP
.br
\fIDF\fP 
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.nf
!>          DF is DOUBLE PRECISION array, dimension (N)
!>          The n diagonal elements of the factor L from the L*D*L'
!>          factorization of A\&.
!> 
.fi
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.br
\fIEF\fP 
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.nf
!>          EF is DOUBLE PRECISION array, dimension (N-1)
!>          The (n-1) subdiagonal elements of the factor L from the
!>          L*D*L' factorization of A\&.
!> 
.fi
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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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.br
\fIRESID\fP 
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.nf
!>          RESID is DOUBLE PRECISION
!>          norm(L*D*L' - A) / (n * norm(A) * EPS)
!> 
.fi
.PP
 
.RE
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\fBAuthor\fP
.RS 4
Univ\&. of Tennessee 

.PP
Univ\&. of California Berkeley 

.PP
Univ\&. of Colorado Denver 

.PP
NAG Ltd\&. 
.RE
.PP

.PP
Definition at line \fB90\fP of file \fBdptt01\&.f\fP\&.
.SH "Author"
.PP 
Generated automatically by Doxygen for LAPACK from the source code\&.