.TH "TESTING/LIN/zgtt02.f" 3 "Version 3.12.0" "LAPACK" \" -*- nroff -*-
.ad l
.nh
.SH NAME
TESTING/LIN/zgtt02.f
.SH SYNOPSIS
.br
.PP
.SS "Functions/Subroutines"

.in +1c
.ti -1c
.RI "subroutine \fBzgtt02\fP (trans, n, nrhs, dl, d, du, x, ldx, b, ldb, resid)"
.br
.RI "\fBZGTT02\fP "
.in -1c
.SH "Function/Subroutine Documentation"
.PP 
.SS "subroutine zgtt02 (character trans, integer n, integer nrhs, complex*16, dimension( * ) dl, complex*16, dimension( * ) d, complex*16, dimension( * ) du, complex*16, dimension( ldx, * ) x, integer ldx, complex*16, dimension( ldb, * ) b, integer ldb, double precision resid)"

.PP
\fBZGTT02\fP 
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\fBPurpose:\fP
.RS 4

.PP
.nf
!>
!> ZGTT02 computes the residual for the solution to a tridiagonal
!> system of equations:
!>    RESID = norm(B - op(A)*X) / (norm(op(A)) * norm(X) * EPS),
!> where EPS is the machine epsilon\&.
!> 
.fi
.PP
 
.RE
.PP
\fBParameters\fP
.RS 4
\fITRANS\fP 
.PP
.nf
!>          TRANS is CHARACTER
!>          Specifies the form of the residual\&.
!>          = 'N':  B - A    * X  (No transpose)
!>          = 'T':  B - A**T * X  (Transpose)
!>          = 'C':  B - A**H * X  (Conjugate transpose)
!> 
.fi
.PP
.br
\fIN\fP 
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.nf
!>          N is INTEGER
!>          The order of the matrix A\&.  N >= 0\&.
!> 
.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
\fIDL\fP 
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.nf
!>          DL is COMPLEX*16 array, dimension (N-1)
!>          The (n-1) sub-diagonal elements of A\&.
!> 
.fi
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.br
\fID\fP 
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.nf
!>          D is COMPLEX*16 array, dimension (N)
!>          The diagonal elements of A\&.
!> 
.fi
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.br
\fIDU\fP 
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.nf
!>          DU is COMPLEX*16 array, dimension (N-1)
!>          The (n-1) super-diagonal elements of A\&.
!> 
.fi
.PP
.br
\fIX\fP 
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!>          X is COMPLEX*16 array, dimension (LDX,NRHS)
!>          The computed 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
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.br
\fIB\fP 
.PP
.nf
!>          B is COMPLEX*16 array, dimension (LDB,NRHS)
!>          On entry, the right hand side vectors for the system of
!>          linear equations\&.
!>          On exit, B is overwritten with the difference B - op(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 - op(A)*X) / (norm(op(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
.PP

.PP
Definition at line \fB122\fP of file \fBzgtt02\&.f\fP\&.
.SH "Author"
.PP 
Generated automatically by Doxygen for LAPACK from the source code\&.