Well, there is always the amazing math library. But somehow, the author
of `math/base` forgot to include a `sums` function!
There *is* a `flvector-sums` in `math/flonum`, which operates only on
flonums. If you can believe this, the documentation for that function
even *gives example code* for computing cumulative sums!
Stupid git.
Neil ⊥
On 01/22/2015 07:35 PM, Matthias Felleisen wrote:
NOTE TO EVERYONE: The OP asked for "without usage of any libraries".
I am sure that sooner or later we will find a library so that we
can say (require lib/cumulative) cumulative-sum.
On Jan 22, 2015, at 7:16 PM, William James wrote:
Here's a way using map-accum in Gauche.
(use gauche.collection)
(define (cumulative-sums xs)
(map-accum (lambda (x sum) (values (+ x sum) (+ x sum))) 0 xs))
(cumulative-sums '(1 3 5 7))
===>
(1 4 9 16)
--------------------------------------------
On Thu, 1/22/15, Alexandr M <rus...@gmail.com> wrote:
Subject: [racket] Calculating cumulative sum of the list
To: users@racket-lang.org
Date: Thursday, January 22, 2015, 7:53 AM
Hello,
I am trying to replicate functionality of this code in
Python:
https://gist.github.com/m-blog/22b7c5d31b3839ffba50#file-cumsum-py
in Racket without usage of any libraries.
What would the most optimal / concise way to do it in
Racket?
Thank you.
--
Best regards,
Alex
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