Initial revision

2000-02-07 10:38:55 +00:00
commit fdc6b051c9
846 changed files with 230218 additions and 0 deletions
--- a/difrac/angl.f
+++ b/difrac/angl.f
@@ -0,0 +1,14 @@
+C-----------------------------------------------------------------------
+C  Calculate the angle between two Cartesian vectors
+C-----------------------------------------------------------------------
+      SUBROUTINE ANGL (X1,Y1,Z1,X2,Y2,Z2,ANGLE)
+      SPROD = X1*X2 + Y1*Y2 + Z1*Z2
+      SMOD = (X1*X1 + Y1*Y1 + Z1*Z1)*(X2*X2 + Y2*Y2 + Z2*Z2)
+      COSIN = SPROD/SQRT(SMOD)
+      IF (COSIN .GE.  1) COSIN =  1
+      IF (COSIN .LT. -1) COSIN = -1
+      ANGLE = ACOS(COSIN)
+      ANGLE = ANGLE*180/3.141593
+      RETURN
+      END
+