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+import graph;
+size(300,IgnoreAspect);
+
+bool3 branch(real x)
+{
+ static int lastsign=0;
+ if(x <= 0 && x == floor(x)) return false;
+ int sign=sgn(gamma(x));
+ bool b=lastsign == 0 || sign == lastsign;
+ lastsign=sign;
+ return b ? true : default;
+}
+
+draw(graph(gamma,-4,4,n=2000,branch),red);
+
+scale(false);
+xlimits(-4,4);
+ylimits(-6,6);
+crop();
+
+xaxis("$x$",RightTicks(NoZero));
+yaxis(LeftTicks(NoZero));
+
+label("$\Gamma(x)$",(1,2),red);