table of contents
/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 |