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ctest checkgrad ref ene and limits
[unres.git]
/
source
/
cluster
/
wham
/
src-M
/
arcos.f
1
FUNCTION ARCOS(X)
2
implicit real*8 (a-h,o-z)
3
include 'COMMON.GEO'
4
IF (DABS(X).LT.1.0D0) GOTO 1
5
ARCOS=0.5D0*(PI-DSIGN(X,1.0D0)*PI)
6
RETURN
7
1 ARCOS=DACOS(X)
8
RETURN
9
END