On Sun, Jul 23, 2017 at 7:30 PM, Zelphir Kaltstahl
<zelphirkaltst...@gmail.com> wrote:
> How can I make my code more efficient, without changing the basic logic of it?

In addition to what I wrote before, there are a couple of places where
you're constructing new lists when you don't need to. In `gini-index`,
for example, you don't actually need the intermediate lists that
you're summing over. You can instead use `for*/sum` and make the whole
thing a lot simpler and more efficient:

(define (gini-index subsets class-labels label-column-index)
  (for*/sum ([subset (in-list subsets)]
             [class-label (in-list class-labels)])
            (calc-proportion subset class-label label-column-index)))

(This is under the assumption that you've changed your data
representation to a list, which you really should.)

And you can make a similar simplification to `calc-proportion`.

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