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saxs and adam's corrections to multichain
[unres.git]
/
source
/
wham
/
src
/
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(1.0D0,X)*PI)
6
RETURN
7
1 ARCOS=DACOS(X)
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RETURN
9
END