************************************************************************
* This file is part of OpenMolcas.                                     *
*                                                                      *
* OpenMolcas is free software; you can redistribute it and/or modify   *
* it under the terms of the GNU Lesser General Public License, v. 2.1. *
* OpenMolcas is distributed in the hope that it will be useful, but it *
* is provided "as is" and without any express or implied warranties.   *
* For more details see the full text of the license in the file        *
* LICENSE or in <http://www.gnu.org/licenses/>.                        *
*                                                                      *
* Copyright (C) 1996-2006, T. Thorsteinsson and D. L. Cooper           *
************************************************************************
      subroutine symtrizcvb3_cvb(vecstr,idelstr)
      implicit real*8 (a-h,o-z)
#include "ext_cvb.fh"
#include "main_cvb.fh"
#include "optze_cvb.fh"
#include "files_cvb.fh"
#include "print_cvb.fh"

      dimension vecstr(nvb),idelstr(nzrvb)

c  Zero coefficients specified by idelstr :
      if(lzrvb.eq.0)then
        do 100 i=1,nzrvb
100     if(idelstr(i).gt.0)vecstr(idelstr(i))=0d0
      else
c  if here, idelstr specifies which structures to *keep* :
        if(nzrvb.ge.1)call fzero(vecstr,idelstr(1)-1)
        do 200 ikeep=1,nzrvb-1
200     call fzero(vecstr(idelstr(ikeep)+1),
     >    idelstr(ikeep+1)-idelstr(ikeep)-1)
      endif
      return
      end
c  *****************************************
c  ** All <-> constrained transformations **
c  *****************************************
