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FUNCTION gammp(a,x)
implicit none
REAL*8 a,gammp,x
CU USES gcf,gser
REAL*8 gammcf,gamser,gln
if(x.lt.0.or.a.le.0)pause 'bad arguments in gammp'
if(x.lt.a+1)then
call gser(gamser,a,x,gln)
gammp=gamser
else
call gcf(gammcf,a,x,gln)
gammp=1-gammcf
endif
return
END
C (C) Copr. 1986-92 Numerical Recipes Software t4.
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