dpot02.f - Man Page

TESTING/LIN/dpot02.f

Synopsis

Functions/Subroutines

subroutine dpot02 (uplo, n, nrhs, a, lda, x, ldx, b, ldb, rwork, resid)
DPOT02

Function/Subroutine Documentation

subroutine dpot02 (character uplo, integer n, integer nrhs, double precision, dimension( lda, * ) a, integer lda, double precision, dimension( ldx, * ) x, integer ldx, double precision, dimension( ldb, * ) b, integer ldb, double precision, dimension( * ) rwork, double precision resid)

DPOT02

Purpose:

``` DPOT02 computes the residual for the solution of a symmetric system
of linear equations  A*x = b:

RESID = norm(B - A*X) / ( norm(A) * norm(X) * EPS ),

where EPS is the machine epsilon.```
Parameters

UPLO

```          UPLO is CHARACTER*1
Specifies whether the upper or lower triangular part of the
symmetric matrix A is stored:
= 'U':  Upper triangular
= 'L':  Lower triangular```

N

```          N is INTEGER
The number of rows and columns of the matrix A.  N >= 0.```

NRHS

```          NRHS is INTEGER
The number of columns of B, the matrix of right hand sides.
NRHS >= 0.```

A

```          A is DOUBLE PRECISION array, dimension (LDA,N)
The original symmetric matrix A.```

LDA

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

X

```          X is DOUBLE PRECISION array, dimension (LDX,NRHS)
The computed solution vectors for the system of linear
equations.```

LDX

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

B

```          B is DOUBLE PRECISION 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 - A*X.```

LDB

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

RWORK

`          RWORK is DOUBLE PRECISION array, dimension (N)`

RESID

```          RESID is DOUBLE PRECISION
The maximum over the number of right hand sides of
norm(B - A*X) / ( norm(A) * norm(X) * EPS ).```
Author

Univ. of Tennessee

Univ. of California Berkeley

NAG Ltd.

Definition at line 125 of file dpot02.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.

Referenced By

The man page dpot02(3) is an alias of dpot02.f(3).

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