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Task/Gamma-function/Ring/gamma-function.ring

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+decimals(3)
+gamma = 0.577
+coeff = -0.655
+quad = -0.042
+qui = 0.166
+set = -0.042
+
+for i=1 to 10
+    see gammafunc(i / 3.0) + nl
+next
+
+func recigamma z
+     return z + gamma * pow(z,2) + coeff * pow(z,3) + quad * pow(z,4) + qui * pow(z,5) + set * pow(z,6)
+
+func gammafunc z
+     if z = 1 return 1
+     but fabs(z) <= 0.5 return 1 / recigamma(z)
+     else return (z - 1) * gammafunc(z-1) ok