X-Git-Url: http://mmka.chem.univ.gda.pl/gitweb/?a=blobdiff_plain;f=source%2Fcluster%2Fwham%2Fsrc-M%2Farcos.f;h=698f704a2e08d2955db2ee3e4da3e12284078b8a;hb=8e66a1b2571905b1e328a33072e0e42a6bc0f829;hp=052a1e4b541287f30debba0e0051fa92b63b3267;hpb=5621dc8f15a30e38c7ccd2e65c731a1a36ceeef0;p=unres.git

diff --git a/source/cluster/wham/src-M/arcos.f b/source/cluster/wham/src-M/arcos.f
index 052a1e4..698f704 100644
--- a/source/cluster/wham/src-M/arcos.f
+++ b/source/cluster/wham/src-M/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(X,1.0D0)*PI)
+      ARCOS=0.5D0*(PI-DSIGN(X,1.0D0)*PI)
       RETURN
     1 ARCOS=DACOS(X)
       RETURN