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dxnrm2.f

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 
      double precision function dxnrm2(n,d,x)
      integer n
      double precision d(*),x(*)
      integer k
      dxnrm2 = 0
      do k = 1,n
        dxnrm2 = dxnrm2 + (x(k)/d(k))**2
      end do
      dxnrm2 = sqrt(dxnrm2)
      end function


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