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/home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/EIG/cget51.f(3) Library Functions Manual /home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/EIG/cget51.f(3)

NAME

/home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/EIG/cget51.f

SYNOPSIS

Functions/Subroutines


subroutine CGET51 (itype, n, a, lda, b, ldb, u, ldu, v, ldv, work, rwork, result)
CGET51

Function/Subroutine Documentation

subroutine CGET51 (integer itype, integer n, complex, dimension( lda, * ) a, integer lda, complex, dimension( ldb, * ) b, integer ldb, complex, dimension( ldu, * ) u, integer ldu, complex, dimension( ldv, * ) v, integer ldv, complex, dimension( * ) work, real, dimension( * ) rwork, real result)

CGET51

Purpose:

!>
!>      CGET51  generally checks a decomposition of the form
!>
!>              A = U B V**H
!>
!>      where **H means conjugate transpose and U and V are unitary.
!>
!>      Specifically, if ITYPE=1
!>
!>              RESULT = | A - U B V**H | / ( |A| n ulp )
!>
!>      If ITYPE=2, then:
!>
!>              RESULT = | A - B | / ( |A| n ulp )
!>
!>      If ITYPE=3, then:
!>
!>              RESULT = | I - U U**H | / ( n ulp )
!> 

Parameters

ITYPE

!>          ITYPE is INTEGER
!>          Specifies the type of tests to be performed.
!>          =1: RESULT = | A - U B V**H | / ( |A| n ulp )
!>          =2: RESULT = | A - B | / ( |A| n ulp )
!>          =3: RESULT = | I - U U**H | / ( n ulp )
!> 

N

!>          N is INTEGER
!>          The size of the matrix.  If it is zero, CGET51 does nothing.
!>          It must be at least zero.
!> 

A

!>          A is COMPLEX array, dimension (LDA, N)
!>          The original (unfactored) matrix.
!> 

LDA

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

B

!>          B is COMPLEX array, dimension (LDB, N)
!>          The factored matrix.
!> 

LDB

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

U

!>          U is COMPLEX array, dimension (LDU, N)
!>          The unitary matrix on the left-hand side in the
!>          decomposition.
!>          Not referenced if ITYPE=2
!> 

LDU

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

V

!>          V is COMPLEX array, dimension (LDV, N)
!>          The unitary matrix on the left-hand side in the
!>          decomposition.
!>          Not referenced if ITYPE=2
!> 

LDV

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

WORK

!>          WORK is COMPLEX array, dimension (2*N**2)
!> 

RWORK

!>          RWORK is REAL array, dimension (N)
!> 

RESULT

!>          RESULT is REAL
!>          The values computed by the test specified by ITYPE.  The
!>          value is currently limited to 1/ulp, to avoid overflow.
!>          Errors are flagged by RESULT=10/ulp.
!> 

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 153 of file cget51.f.

Author

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Version 3.12.0 LAPACK