I was playing with the same code converted into HTBasic. With your input data 1, 2, 0, 4, 5, 6, 8, 10 I am getting the following results after calling the transform function once: 0: 1.63835743042 (same) 1: 3.69032741985 (same) 2: 7.93296810697 (very different) 3: 12.1941911655 (very different) 4: -2.50954891121 (very different) 5: 0.388228567654 (same) 6: -0.129409522551 (very different) 7: -3.40612438338 (very different) I do get the correct number of elements. Note that I said "after calling the transform function ONCE", on the bearcave site in the daub.java code, you can see that the function is called multiple times, depending on the size of the input array. I am very eager to find what can be wrong with our implementation!