table of contents
double_eig(3) | LAPACK | double_eig(3) |
NAME¶
double_eigSYNOPSIS¶
Functions¶
subroutine dlarfy (UPLO, N, V, INCV, TAU, C, LDC, WORK)
DLARFY
Detailed Description¶
This is the group of double LAPACK TESTING EIG routines.Function Documentation¶
subroutine dlarfy (character UPLO, integer N, double precision, dimension( * ) V, integer INCV, double precision TAU, double precision, dimension( ldc, * ) C, integer LDC, double precision, dimension( * ) WORK)¶
DLARFYPurpose:
DLARFY applies an elementary reflector, or Householder matrix, H, to an n x n symmetric matrix C, from both the left and the right. H is represented in the form H = I - tau * v * v' where tau is a scalar and v is a vector. If tau is zero, then H is taken to be the unit matrix.
Parameters:
UPLO
UPLO is CHARACTER*1 Specifies whether the upper or lower triangular part of the symmetric matrix C is stored. = 'U': Upper triangle = 'L': Lower triangle
N
N is INTEGER The number of rows and columns of the matrix C. N >= 0.
V
V is DOUBLE PRECISION array, dimension (1 + (N-1)*abs(INCV)) The vector v as described above.
INCV
INCV is INTEGER The increment between successive elements of v. INCV must not be zero.
TAU
TAU is DOUBLE PRECISION The value tau as described above.
C
C is DOUBLE PRECISION array, dimension (LDC, N) On entry, the matrix C. On exit, C is overwritten by H * C * H'.
LDC
LDC is INTEGER The leading dimension of the array C. LDC >= max( 1, N ).
WORK
WORK is DOUBLE PRECISION array, dimension (N)
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
December 2016
Author¶
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