Typically there are better ways to operate on sequences than to put all the
elements on the stack, but you could:
( scratchpad ) { 0 1 2 3 } dup length firstn
Better might be to use some combinators to act on the sequence each grabbing
the element that they need (bi, tri, or the more general cleave):
( scratchpad ) { 0 1 2 3 } {
[ first ]
[ second ]
[ third ]
} cleave
On Wed, Aug 24, 2011 at 6:50 PM, Andrew Pennebaker <
andrew.penneba...@gmail.com> wrote:
> Is there a word more general than firstn? I'd like to push all the elements
> of a sequence onto the stack.
>
>
> Cheers,
>
> Andrew Pennebaker
> www.yellosoft.us
>
> On Sun, Aug 21, 2011 at 2:26 PM, Alexander J. Vondrak <
> ajvond...@csupomona.edu> wrote:
>
>> first2: http://docs.factorcode.org/content/word-first2,sequences.html
>>
>> In general, firstn:
>> http://docs.factorcode.org/content/word-firstn,sequences.generalizations.html
>>
>> Regards,
>> --Alex Vondrak
>> ________________________________________
>> From: Andrew Pennebaker [andrew.penneba...@gmail.com]
>> Sent: Sunday, August 21, 2011 11:20 AM
>> To: Factor
>> Subject: [Factor-talk] sequences and the stack
>>
>> The stack contains a sequence of number pairs:
>>
>> { { x1 y1 } { x2 y2 } { x3 y3 } ... }
>>
>> I want to map over the pairs, accessing xi and yi.
>>
>> [
>> ! stack = { xi yi }
>>
>> ! ...
>>
>> ! stack = xi yi
>> ] map
>>
>> What's the code that goes in !... ?
>>
>> Other than using nth, how can I do this? Is there a word that pops the
>> elements of a sequence onto the stack?
>>
>> Cheers,
>>
>> Andrew Pennebaker
>> www.yellosoft.us<http://www.yellosoft.us>
>>
>>
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