September 2017 Update

Task/Executable-library/Zkl/executable-library-2.zkl

@@ -0,0 +1,12 @@
+#!/home/craigd/Bin/zkl
+collatz:=Import("hailstone",False,False,False).collatz; // don't run constructor
+d:=Dictionary();
+[2..0d100_000].pump(Void,  // loop n from 2 to 100,000
+   collatz,       // generate Collatz sequence(n)
+   'wrap(c){ d.incV(c.len()) }      // save length
+);
+println("Number of different lengths: ",d.len());
+longest:=(0).max(d.values);
+mostFreqLen:=d.filter1('wrap([(k,v)]){ v==longest })[0];
+println("Most frequent length: %d; %d sequences of that length."
+        .fmt(mostFreqLen,longest));