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!! @author Charles F. Vardeman II |
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!! @author Matthew Meineke |
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!! @version $Id: do_Forces.F90,v 1.15 2003-04-11 15:16:59 gezelter Exp $, $Date: 2003-04-11 15:16:59 $, $Name: not supported by cvs2svn $, $Revision: 1.15 $ |
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!! @version $Id: do_Forces.F90,v 1.16 2003-07-01 22:39:53 gezelter Exp $, $Date: 2003-07-01 22:39:53 $, $Name: not supported by cvs2svn $, $Revision: 1.16 $ |
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module do_Forces |
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use force_globals |
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real (kind = dp), dimension(3) :: q_i |
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real (kind = dp), dimension(3) :: q_j |
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real ( kind = dp ), intent(out) :: r_sq |
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real( kind = dp ) :: d(3) |
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real( kind = dp ) :: d_old(3) |
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real( kind = dp ) :: d(3), scaled(3) |
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integer i |
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d(1:3) = q_j(1:3) - q_i(1:3) |
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d_old = d |
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! Wrap back into periodic box if necessary |
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if ( SimUsesPBC() ) then |
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d(1:3) = d(1:3) - box(1:3) * sign(1.0_dp,d(1:3)) * & |
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int(abs(d(1:3)/box(1:3)) + 0.5_dp) |
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if( .not.boxIsOrthorhombic ) then |
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! calc the scaled coordinates. |
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scaled = matmul(d, HmatInv) |
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! wrap the scaled coordinates |
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do i = 1, 3 |
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scaled(i) = scaled(i) - anint(scaled(i)) |
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enddo |
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! calc the wrapped real coordinates from the wrapped scaled |
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! coordinates |
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d = matmul(scaled,Hmat) |
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else |
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! calc the scaled coordinates. |
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do i = 1, 3 |
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scaled(i) = d(i) * HmatInv(i,i) |
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! wrap the scaled coordinates |
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scaled(i) = scaled(i) - anint(scaled(i)) |
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! calc the wrapped real coordinates from the wrapped scaled |
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! coordinates |
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d(i) = scaled(i)*Hmat(i,i) |
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enddo |
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endif |
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endif |
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r_sq = dot_product(d,d) |
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end subroutine get_interatomic_vector |
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subroutine check_initialization(error) |
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integer, intent(out) :: error |
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