sget54.f - Man Page

TESTING/EIG/sget54.f

Synopsis

Functions/Subroutines

subroutine sget54 (n, a, lda, b, ldb, s, lds, t, ldt, u, ldu, v, ldv, work, result)
SGET54

Function/Subroutine Documentation

subroutine sget54 (integer n, real, dimension( lda, * ) a, integer lda, real, dimension( ldb, * ) b, integer ldb, real, dimension( lds, * ) s, integer lds, real, dimension( ldt, * ) t, integer ldt, real, dimension( ldu, * ) u, integer ldu, real, dimension( ldv, * ) v, integer ldv, real, dimension( * ) work, real result)

SGET54

Purpose:

``` SGET54 checks a generalized decomposition of the form

A = U*S*V'  and B = U*T* V'

where ' means transpose and U and V are orthogonal.

Specifically,

RESULT = ||( A - U*S*V', B - U*T*V' )|| / (||( A, B )||*n*ulp )```
Parameters

N

```          N is INTEGER
The size of the matrix.  If it is zero, SGET54 does nothing.
It must be at least zero.```

A

```          A is REAL array, dimension (LDA, N)
The original (unfactored) matrix A.```

LDA

```          LDA is INTEGER
The leading dimension of A.  It must be at least 1
and at least N.```

B

```          B is REAL array, dimension (LDB, N)
The original (unfactored) matrix B.```

LDB

```          LDB is INTEGER
The leading dimension of B.  It must be at least 1
and at least N.```

S

```          S is REAL array, dimension (LDS, N)
The factored matrix S.```

LDS

```          LDS is INTEGER
The leading dimension of S.  It must be at least 1
and at least N.```

T

```          T is REAL array, dimension (LDT, N)
The factored matrix T.```

LDT

```          LDT is INTEGER
The leading dimension of T.  It must be at least 1
and at least N.```

U

```          U is REAL array, dimension (LDU, N)
The orthogonal matrix on the left-hand side in the
decomposition.```

LDU

```          LDU is INTEGER
The leading dimension of U.  LDU must be at least N and
at least 1.```

V

```          V is REAL array, dimension (LDV, N)
The orthogonal matrix on the left-hand side in the
decomposition.```

LDV

```          LDV is INTEGER
The leading dimension of V.  LDV must be at least N and
at least 1.```

WORK

`          WORK is REAL array, dimension (3*N**2)`

RESULT

```          RESULT is REAL
The value RESULT, It is currently limited to 1/ulp, to
avoid overflow. Errors are flagged by RESULT=10/ulp.```
Author

Univ. of Tennessee

Univ. of California Berkeley

NAG Ltd.

Definition at line 154 of file sget54.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.

Referenced By

The man page sget54(3) is an alias of sget54.f(3).

Tue Nov 28 2023 12:08:42 Version 3.12.0 LAPACK