c Copyright (C) 2008 VZLU Prague, a.s., Czech Republic c c Author: Jaroslav Hajek <highegg@gmail.com> c c This file is part of OctGPR. c c OctGPR is free software; you can redistribute it and/or modify c it under the terms of the GNU General Public License as published by c the Free Software Foundation; either version 2 of the License, or c (at your option) any later version. c c This program is distributed in the hope that it will be useful, c but WITHOUT ANY WARRANTY; without even the implied warranty of c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the c GNU General Public License for more details. c c You should have received a copy of the GNU General Public License c along with this software; see the file COPYING. If not, see c <http://www.gnu.org/licenses/>. c subroutine dsdacc(n,x,y,x2,xy) c purpose: an assistant subroutine. Accumulates the dot product c x'*y as well as sum of squares x'*x in one pass. c arguments: c n (in) length of x,y c x,y (in) vectors in question c x2 (out) x'*x c xy (out) x'*y c integer n double precision x(*),y(*),x2,xy integer i xy = 0 x2 = 0 do i = 1,n x2 = x2 + x(i)**2 xy = xy + x(i)*y(i) end do end subroutine

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