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[unres.git]
/
source
/
cluster
/
wham
/
src
/
arcos.f
1
FUNCTION ARCOS(X)
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implicit real*8 (a-h,o-z)
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include 'COMMON.GEO'
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IF (DABS(X).LT.1.0D0) GOTO 1
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ARCOS=0.5D0*(PI-DSIGN(X,1.0D0)*PI)
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RETURN
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1 ARCOS=DACOS(X)
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RETURN
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END