Пример #1
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int main()
{
   double d = psigamma(2.0, 4);
   return d != 0 ? 0 : 1;
}
Пример #2
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 /* n'th order derivative of log gamma function */
 double D_lgamma(double x, double n){
   if(n<.5)return lgammafn(x);
   else return psigamma(x,n-1.0);
 }