zgtt02.f - Man Page

TESTING/LIN/zgtt02.f

Synopsis

Functions/Subroutines

subroutine zgtt02 (trans, n, nrhs, dl, d, du, x, ldx, b, ldb, resid)
ZGTT02

Function/Subroutine Documentation

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)

ZGTT02

Purpose:

``` 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.```
Parameters

TRANS

```          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)```

N

```          N is INTEGER
The order of the matrix A.  N >= 0.```

NRHS

```          NRHS is INTEGER
The number of right hand sides, i.e., the number of columns
of the matrices B and X.  NRHS >= 0.```

DL

```          DL is COMPLEX*16 array, dimension (N-1)
The (n-1) sub-diagonal elements of A.```

D

```          D is COMPLEX*16 array, dimension (N)
The diagonal elements of A.```

DU

```          DU is COMPLEX*16 array, dimension (N-1)
The (n-1) super-diagonal elements of A.```

X

```          X is COMPLEX*16 array, dimension (LDX,NRHS)
The computed solution vectors X.```

LDX

```          LDX is INTEGER
The leading dimension of the array X.  LDX >= max(1,N).```

B

```          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.```

LDB

```          LDB is INTEGER
The leading dimension of the array B.  LDB >= max(1,N).```

RESID

```          RESID is DOUBLE PRECISION
norm(B - op(A)*X) / (norm(op(A)) * norm(X) * EPS)```
Author

Univ. of Tennessee

Univ. of California Berkeley

NAG Ltd.

Definition at line 122 of file zgtt02.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.

Referenced By

The man page zgtt02(3) is an alias of zgtt02.f(3).

Tue Nov 28 2023 12:08:43 Version 3.12.0 LAPACK