Provided by: liblapack-doc_3.8.0-2_all
Functions subroutine dlarfy (UPLO, N, V, INCV, TAU, C, LDC, WORK) DLARFY
This is the group of double LAPACK TESTING EIG routines.
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) DLARFY Purpose: 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
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