[plt-scheme] help on how to write a frequency-counting function in a more functional way

On Mon, Apr 20, 2009 at 3:31 AM, Matthias Felleisen
<matthias at ccs.neu.edu> wrote:
>
> As soon as you have 100,000 frequencies in an approximate range of 20,000
> steps, the functional solutions don't look that good compared to vectors.
> With 1,000,000 it's unquestionable. I bet you can repeat this experiment in
> C and get similar results. In a sparse world, the results are indifferent.

Something I've been wondering about - is sticking to purely functional
data structures really idiomatic scheme? Specifically in PLT, do they
buy you any advantage over the imperative, mutable versions?

martin