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C Copyright (c) 2003-2010 University of Florida
C
C This program 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 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 The GNU General Public License is included in this distribution
C in the file COPYRIGHT.
SUBROUTINE CMP_ANGLE(ILFTEND, IMIDLE, IRHTEND, CARTCOORD,
& VLUANGLE, NRATMS)
C
C This is a simple routine to calculate the angle between two vectors,
C ILFTEND and IRHTEND and the center is IMIDLE. The angle is retrun
C in VLUANGLE.
C
IMPLICIT DOUBLE PRECISION (A-H, O-Z)
C
DIMENSION CARTCOORD(3*NRATMS), VEC1(3), VEC2(3)
CALL VEC(CARTCOORD(IMIDLE*3 - 2), CARTCOORD(ILFTEND*3 - 2),
& VEC1, 1)
C
CALL VEC(CARTCOORD(IMIDLE*3 - 2), CARTCOORD(IRHTEND*3 - 2),
& VEC2, 1)
VLUANGLE = ANGLE(VEC1, VEC2, 3)
C
RETURN
END
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