This isn't smooth, but it works:
#lang at-exp racket
(first (regexp-match @pregexp{\d+\.\d{0,4}} "15.123456789"))
(first (regexp-match @pregexp{\d+\.\d{0,4}} "15.12"))
On Thu, May 25, 2017 at 7:59 AM, Alasdair McAndrew <amc...@gmail.com> wrote:
> In (standard) Racket, I can display a real number x to (say) 4 decimal
> places using something like
>
> (displayln (string->number (real->decimal-string x 4)))
>
> This is handy for printing out multiple versions of a list or vector of
> real numbers, and seeing how they change.
>
> I would like to do the same thing with a BigFloat. I can convert it to a
> string, but the "bigfloat->string" construct doesn't have an extra
> parameter to limit the number of displayed decimal places. Is there a
> simple way of displaying a bigfloat with only a limited number of decimal
> places?
>
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