TESTING/EIG/cget51.f(3)

NAME
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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