.TH "TESTING/LIN/cptt02.f" 3 "Version 3.12.0" "LAPACK" \" -*- nroff -*-
.ad l
.nh
.SH NAME
TESTING/LIN/cptt02.f
.SH SYNOPSIS
.br
.PP
.SS "Functions/Subroutines"

.in +1c
.ti -1c
.RI "subroutine \fBcptt02\fP (uplo, n, nrhs, d, e, x, ldx, b, ldb, resid)"
.br
.RI "\fBCPTT02\fP "
.in -1c
.SH "Function/Subroutine Documentation"
.PP 
.SS "subroutine cptt02 (character uplo, integer n, integer nrhs, real, dimension( * ) d, complex, dimension( * ) e, complex, dimension( ldx, * ) x, integer ldx, complex, dimension( ldb, * ) b, integer ldb, real resid)"

.PP
\fBCPTT02\fP 
.PP
\fBPurpose:\fP
.RS 4

.PP
.nf
 CPTT02 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
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\fID\fP 
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.nf
          D is REAL array, dimension (N)
          The n diagonal elements of the tridiagonal matrix A\&.
.fi
.PP
.br
\fIE\fP 
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.nf
          E is COMPLEX array, dimension (N-1)
          The (n-1) subdiagonal elements of the tridiagonal matrix A\&.
.fi
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.br
\fIX\fP 
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.nf
          X is COMPLEX 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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.nf
          LDX is INTEGER
          The leading dimension of the array X\&.  LDX >= max(1,N)\&.
.fi
.PP
.br
\fIB\fP 
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.nf
          B is COMPLEX 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
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.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 REAL
          norm(B - A*X) / (norm(A) * norm(X) * EPS)
.fi
.PP
 
.RE
.PP
\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
.PP

.PP
Definition at line \fB114\fP of file \fBcptt02\&.f\fP\&.
.SH "Author"
.PP 
Generated automatically by Doxygen for LAPACK from the source code\&.