I use these guys all the time:
http://github.com/untyped/unlib/blob/master/for.ss
No guarantees that I'm not duplicating other peoples' efforts.
Cheers,
-- Dave
On 22 Aug 2010, at 07:26, Noel Welsh wrote:
> Hi Will,
>
> My "numerics" package on Github has for/vector with some slight
> extensions to yours. I think it also has more error checking so you
> might want to look at it. I also have for/fold/vector and some
> sequence abstractions. The code is all parameterised at expansion time
> by the vector representation.
>
> http://github.com/noelwelsh/numeric
>
> N.
>
>
> On Wed, Aug 18, 2010 at 5:02 PM, Will M. Farr <wmf...@gmail.com> wrote:
>> Hello all,
>>
>> I've been thinking for a while about putting together a PLaneT library of
>> some iteration/comprehension forms that I often use that are not found in
>> the racket core. Right now, I have a small it-comp.plt local PLaneT package
>> that contains
>>
>> for/vector
>> for/flvector
>> in-flvector
>>
>> The for/... forms have the option of having a first expression that gives
>> the length of the resulting object (similar to srfi-42's vector-of-length-ec
>> form) to allow generating more efficient code:
>>
>> (for/vector ((x (in-range 3))) x) => (vector 0 1 2)
>> (for/vector 3 ((x (in-range 3))) x) => (vector 0 1 2) ; but more efficiently
>>
>> I'll be adding more forms from time to time, as I need them. Eventually,
>> I'll release this to PLaneT, but I thought I might ask the community two
>> questions first:
>>
>> 1. Am I duplicating the functionality of some library? (If so, I'll just
>> contribute to that instead.)
>> 2. Do you have any iteration "favorites" that I should include in the
>> library? (Code welcome, but I'm also happy to implement suggestions myself.)
>>
>> Alternately, if you guys want to add these to the core, I'd be happy to
>> contribute code and tests....
>>
>> Thanks,
>> Will
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