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DLARFX(l)) DLARFX(l)NAMEDLARFX - applie a real elementary reflector H to a real m by n matrix C, from either the left or the rightSYNOPSISSUBROUTINE DLARFX( SIDE, M, N, V, TAU, C, LDC, WORK ) CHARACTER SIDE INTEGER LDC, M, N DOUBLE PRECISION TAU DOUBLE PRECISION C( LDC, * ), V( * ), WORK( * )PURPOSEDLARFX applies a real elementary reflector H to a real m by n matrix C, from either the left or the right. H is represented in the form H = I - tau * v * v' where tau is a real scalar and v is a real vector. If tau = 0, then H is taken to be the unit matrix This version uses inline code if H has order < 11.ARGUMENTSSIDE (input) CHARACTER*1 = 'L': form H * C = 'R': form C * H M (input) INTEGER The number of rows of the matrix C. N (input) INTEGER The number of columns of the matrix C. V (input) DOUBLE PRECISION array, dimension (M) if SIDE = 'L' or (N) if SIDE = 'R' The vector v in the representation of H. TAU (input) DOUBLE PRECISION The value tau in the representation of H. C (input/output) DOUBLE PRECISION array, dimension (LDC,N) On entry, the m by n matrix C. On exit, C is overwritten by the matrix H * C if SIDE = 'L', or C * H if SIDE = 'R'. LDC (input) INTEGER The leading dimension of the array C. LDA >= (1,M). WORK (workspace) DOUBLE PRECISION array, dimension (N) if SIDE = 'L' or (M) if SIDE = 'R' WORK is not referenced if H has order < 11.LAPACK version 3.015 June 2000 DLARFX(l)

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