[racket-dev] Feature request- combined argmin and argmax in a single function

The science collection already has such a function (minimum-maximum
a-sequence) that works for any sequence - e.g., lists or vectors. For
example:

#lang racket

(require (planet williams/science/science))

(minimum-maximum
 (for/list ((i (in-range 100000)))
   (random-unit-gaussian)))

(minimum-maximum
 (for/vector #:length 100000
             ((i (in-range 100000)))
   (random-unit-gaussian)))


Doug


On Wed, Jun 27, 2012 at 1:10 PM, Harry Spier <vasishtha.spier at gmail.com> wrote:
> It might be useful to add to the language a combined function such as
> (argminmax proc lst) that returned both the minimum and maximum values
> of applying proc to lst.  So that for very large lists (or for very
> large numbers of lists where you need to know the min and max values
> in the lists)  instead of having to traverse the lists twice (once
> with argmin and once with argmax) you'd now only have to trarverse the
> list once with argminmax.
>
> Thanks,
> Harry Spier
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