Hi Simon,
It's the signum function sgn of course, implemented in racket as sgn, but
not in guile or the SRFI's with guile AFAIK.
You could also say in Scheme:
(define (sgn n)
(cond ((negative? n) -1)
((positive? n) 1)
(else 0)))
A dozen ways to implement, of course, Would be worth having this function
somewhere in the lily libraries.
Andrew
On 17 April 2017 at 21:06, Simon Albrecht <[email protected]> wrote:
> Am 16.04.2017 um 19:29 schrieb Thomas Morley:
>
>> #(define (sign x)
>> (if (= x 0)
>> 0
>> (if (< x 0) -1 1)))
>>
>
> I can hardly imagine that default guile or any SRFI doesn’t already
> provide such a function – unfortunately I’m not well-versed enough to know…
> Anyone?
>
>
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