table of contents
/home/abuild/rpmbuild/BUILD/lapack-3.12.0/SRC/claqhp.f(3) | Library Functions Manual | /home/abuild/rpmbuild/BUILD/lapack-3.12.0/SRC/claqhp.f(3) |
NAME¶
/home/abuild/rpmbuild/BUILD/lapack-3.12.0/SRC/claqhp.f
SYNOPSIS¶
Functions/Subroutines¶
subroutine CLAQHP (uplo, n, ap, s, scond, amax, equed)
CLAQHP scales a Hermitian matrix stored in packed form.
Function/Subroutine Documentation¶
subroutine CLAQHP (character uplo, integer n, complex, dimension( * ) ap, real, dimension( * ) s, real scond, real amax, character equed)¶
CLAQHP scales a Hermitian matrix stored in packed form.
Purpose:
!> !> CLAQHP equilibrates a Hermitian matrix A using the scaling factors !> in the vector S. !>
Parameters
UPLO
!> UPLO is CHARACTER*1 !> Specifies whether the upper or lower triangular part of the !> Hermitian matrix A is stored. !> = 'U': Upper triangular !> = 'L': Lower triangular !>
N
!> N is INTEGER !> The order of the matrix A. N >= 0. !>
AP
!> AP is COMPLEX array, dimension (N*(N+1)/2) !> On entry, the upper or lower triangle of the Hermitian matrix !> A, packed columnwise in a linear array. The j-th column of A !> is stored in the array AP as follows: !> if UPLO = 'U', AP(i + (j-1)*j/2) = A(i,j) for 1<=i<=j; !> if UPLO = 'L', AP(i + (j-1)*(2n-j)/2) = A(i,j) for j<=i<=n. !> !> On exit, the equilibrated matrix: diag(S) * A * diag(S), in !> the same storage format as A. !>
S
!> S is REAL array, dimension (N) !> The scale factors for A. !>
SCOND
!> SCOND is REAL !> Ratio of the smallest S(i) to the largest S(i). !>
AMAX
!> AMAX is REAL !> Absolute value of largest matrix entry. !>
EQUED
!> EQUED is CHARACTER*1 !> Specifies whether or not equilibration was done. !> = 'N': No equilibration. !> = 'Y': Equilibration was done, i.e., A has been replaced by !> diag(S) * A * diag(S). !>
Internal Parameters:
!> THRESH is a threshold value used to decide if scaling should be done !> based on the ratio of the scaling factors. If SCOND < THRESH, !> scaling is done. !> !> LARGE and SMALL are threshold values used to decide if scaling should !> be done based on the absolute size of the largest matrix element. !> If AMAX > LARGE or AMAX < SMALL, scaling is done. !>
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Definition at line 125 of file claqhp.f.
Author¶
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Version 3.12.0 | LAPACK |