Chimie Théorique » Opt'n Path

     FUNCTION SinAngle(v1x,v1y,v1z,norm1,v2x,v2y,v2z,norm2)

!----------------------------------------------------------------------

!  Copyright 2003-2014 Ecole Normale Supérieure de Lyon,

!  Centre National de la Recherche Scientifique,

!  Université Claude Bernard Lyon 1. All rights reserved.

!

!  This work is registered with the Agency for the Protection of Programs

!  as IDDN.FR.001.100009.000.S.P.2014.000.30625

!

!  Authors: P. Fleurat-Lessard, P. Dayal

!  Contact: optnpath@gmail.com

!

! This file is part of "Opt'n Path".

!

!  "Opt'n Path" is free software: you can redistribute it and/or modify

!  it under the terms of the GNU Affero General Public License as

!  published by the Free Software Foundation, either version 3 of the License,

!  or (at your option) any later version.

!

!  "Opt'n Path" is distributed in the hope that it will be useful,

!  but WITHOUT ANY WARRANTY; without even the implied warranty of

!

!  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

!  GNU Affero General Public License for more details.

!

!  You should have received a copy of the GNU Affero General Public License

!  along with "Opt'n Path". If not, see <http://www.gnu.org/licenses/>.

!

! Contact The Office of Technology Licensing, valorisation@ens-lyon.fr,

! for commercial licensing opportunities.

!----------------------------------------------------------------------

       use Path_module, only :  KREAL

       IMPLICIT NONE

       real(KREAL) ::  v1x,v1y,v1z,norm1

       real(KREAL) ::  v2x,v2y,v2z,norm2

       real(KREAL) ::  SinAngle

       if (norm1<=1d-6) STOP "ERROR in SinAngle, norm1<=1e-6"

       if (norm2<=1d-6) STOP "ERROR in SinAngle, norm2<=1e-6"

       Sinangle=sqrt(1.-((v1x*v2x+v1y*v2y+v1z*V2z)/(norm1*norm2))**2)

     END FUNCTION SINANGLE