arcos = 0.5D0*(PI-DSIGN(1.0D0,X)*PI)

[unres.git] / source / wham / src / arcos.f

diff --git a/source/wham/src/arcos.f b/source/wham/src/arcos.f
index 69810ea..afc6724 100644 (file)
--- a/source/wham/src/arcos.f
+++ b/source/wham/src/arcos.f
@@ -2,7 +2,7 @@
       implicit real*8 (a-h,o-z)
       include 'COMMON.GEO'
       IF (DABS(X).LT.1.0D0) GOTO 1
-      ARCOS=0.5D0*(PI+DSIGN(1.0D0,X)*PI)
+      ARCOS=0.5D0*(PI-DSIGN(1.0D0,X)*PI)
       RETURN
     1 ARCOS=DACOS(X)
       RETURN