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@@ -0,0 +1,20 @@
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FUNCTION gammln(xx)
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REAL gammln,xx
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INTEGER j
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DOUBLE PRECISION ser,stp,tmp,x,y,cof(6)
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SAVE cof,stp
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DATA cof,stp/76.18009172947146d0,-86.50532032941677d0,
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*24.01409824083091d0,-1.231739572450155d0,.1208650973866179d-2,
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*-.5395239384953d-5,2.5066282746310005d0/
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x=xx
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y=x
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tmp=x+5.5d0
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tmp=(x+0.5d0)*log(tmp)-tmp
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ser=1.000000000190015d0
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do 11 j=1,6
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y=y+1.d0
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ser=ser+cof(j)/y
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11 continue
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gammln=tmp+log(stp*ser/x)
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return
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END
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