.TH "TESTING/LIN/zptt02.f" 3 "Version 3.12.0" "LAPACK" \" -*- nroff -*-
.ad l
.nh
.SH NAME
TESTING/LIN/zptt02.f
.SH SYNOPSIS
.br
.PP
.SS "Functions/Subroutines"

.in +1c
.ti -1c
.RI "subroutine \fBzptt02\fP (uplo, n, nrhs, d, e, x, ldx, b, ldb, resid)"
.br
.RI "\fBZPTT02\fP "
.in -1c
.SH "Function/Subroutine Documentation"
.PP 
.SS "subroutine zptt02 (character uplo, integer n, integer nrhs, double precision, dimension( * ) d, complex*16, dimension( * ) e, complex*16, dimension( ldx, * ) x, integer ldx, complex*16, dimension( ldb, * ) b, integer ldb, double precision resid)"

.PP
\fBZPTT02\fP 
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\fBPurpose:\fP
.RS 4

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.nf
!>
!> ZPTT02 computes the residual for the solution to a symmetric
!> tridiagonal system of equations:
!>    RESID = norm(B - A*X) / (norm(A) * norm(X) * 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 superdiagonal or the subdiagonal of the
!>          tridiagonal matrix A is stored\&.
!>          = 'U':  E is the superdiagonal of A
!>          = 'L':  E is the subdiagonal of A
!> 
.fi
.PP
.br
\fIN\fP 
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.nf
!>          N is INTEGER
!>          The order of the matrix A\&.
!> 
.fi
.PP
.br
\fINRHS\fP 
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.nf
!>          NRHS is INTEGER
!>          The number of right hand sides, i\&.e\&., the number of columns
!>          of the matrices B and X\&.  NRHS >= 0\&.
!> 
.fi
.PP
.br
\fID\fP 
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!>          D is DOUBLE PRECISION array, dimension (N)
!>          The n diagonal elements of the tridiagonal matrix A\&.
!> 
.fi
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.br
\fIE\fP 
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.nf
!>          E is COMPLEX*16 array, dimension (N-1)
!>          The (n-1) subdiagonal elements of the tridiagonal matrix A\&.
!> 
.fi
.PP
.br
\fIX\fP 
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.nf
!>          X is COMPLEX*16 array, dimension (LDX,NRHS)
!>          The n by nrhs matrix of solution vectors X\&.
!> 
.fi
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.br
\fILDX\fP 
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!>          LDX is INTEGER
!>          The leading dimension of the array X\&.  LDX >= max(1,N)\&.
!> 
.fi
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\fIB\fP 
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.nf
!>          B is COMPLEX*16 array, dimension (LDB,NRHS)
!>          On entry, the n by nrhs matrix of right hand side vectors B\&.
!>          On exit, B is overwritten with the difference B - A*X\&.
!> 
.fi
.PP
.br
\fILDB\fP 
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.nf
!>          LDB is INTEGER
!>          The leading dimension of the array B\&.  LDB >= max(1,N)\&.
!> 
.fi
.PP
.br
\fIRESID\fP 
.PP
.nf
!>          RESID is DOUBLE PRECISION
!>          norm(B - A*X) / (norm(A) * norm(X) * EPS)
!> 
.fi
.PP
 
.RE
.PP
\fBAuthor\fP
.RS 4
Univ\&. of Tennessee 

.PP
Univ\&. of California Berkeley 

.PP
Univ\&. of Colorado Denver 

.PP
NAG Ltd\&. 
.RE
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.PP
Definition at line \fB114\fP of file \fBzptt02\&.f\fP\&.
.SH "Author"
.PP 
Generated automatically by Doxygen for LAPACK from the source code\&.