Bug #19024 for List-MoreUtils: wishlist: ltsorted, gtsorted

Mon May 01 23:09:10 2006 Guest - Ticket created

Subject:

wishlist: ltsorted, gtsorted

implement test functions $a < $b < $c and $a > $b > $c , etc. for large lists these functions would be more efficient than creating a sorted copy and comparing the two lists.

Wed May 03 07:46:40 2006 tassilo.von.parseval [...] rwth-aachen.de - Correspondence added

Subject:	WG: [rt.cpan.org #19024] wishlist: ltsorted, gtsorted
Date:	Wed, 03 May 2006 07:46:03 -0400
To:	bug-List-MoreUtils [...] rt.cpan.org
From:	Tassilo von Parseval <Tassilo.von.Parseval [...] rwth-aachen.de>

Hi there, Show quoted text

----- Originalnachricht ----- Von: Guest via RT <bug-List-MoreUtils@rt.cpan.org> Datum: Montag, Mai 1, 2006 11:09 pm Betreff: [rt.cpan.org #19024] wishlist: ltsorted, gtsorted

> > Mon May 01 23:09:10 2006: Request 19024 was acted upon. > Transaction: Ticket created by guest > Queue: List-MoreUtils > Subject: wishlist: ltsorted, gtsorted > Owner: Nobody > Requestors: DarGo@sPam.lA > Status: new > Ticket <URL: http://rt.cpan.org/Ticket/Display.html?id=19024 > > > > implement test functions $a < $b < $c and $a > $b > $c , etc. for > largelists these functions would be more efficient than creating a > sortedcopy and comparing the two lists.

So if I get you correctly, these are functions that, given a list, return true if the list is sorted in the given order (lt or gt)? I've added it to the to-do list. Note however that it may take me a couple of months before I can make new CPAN releases as I've just started a new job in NYC and don't yet have a computer (other than the ones on the job which I can't use for CPAN uploads). Cheers, Tassilo

Wed May 03 07:46:41 2006 The RT System itself - Status changed from 'new' to 'open'

Fri Mar 02 22:34:28 2012 mschwern [...] cpan.org - Ticket #75497: Ticket created

Subject:

Operate on a sliding set of pairs

I'm finding myself in need of a function to do operation on pairs of elements in a list like so: 0 and 1 1 and 2 2 and 3 3 and 4 and so on For example... # 0 and 1, 1 and 2, 2 and 3. print join ", ", slide { "$a and $b" } (0, 1, 2, 3); This would be useful for performing operations *between* two elements in a list. It replaces loops like this: my $last_thing; for my $thing (@things) { return $last_thing if $thing > $blah; $last_thing = $thing; } With this: my $thing; slide { $thing = $a if $b > $blah } @things; It would be nice to avoid having a whole set of these functions (grep, map, first, etc...) by perhaps having an iterator which can generate pairs without having to create a double side list. my $slider = make_slider \@things; while( my($a, $b) = $slider->next ) { ... } This may be out of scope for List::MoreUtils.

Fri Jun 15 05:21:40 2012 EDAVIS [...] cpan.org - Correspondence added

If I could add my two cents: I suggest functions 'sorted' (which does a 'cmp' comparison) and 'sorted_num' (which uses <=>). Testing for reverse order can be done as sorted(reverse @a) so it is probably not necessary to add a separate function.

Sun Jul 08 10:10:06 2012 perl [...] toby.ink - Correspondence added

Or: sub sorted (&@) { ...; } sub sorted_numerically { unshift @_, sub { $a <=> $b }; goto \&sorted; } sub sorted_alphabetically { unshift @_, sub { $a cmp $b }; goto \&sorted; }

Tue Mar 10 07:25:15 2015 REHSACK [...] cpan.org - Ticket #75497: Correspondence added

This is a reasonable base function as tobyink showed up for RT#19024's wish ...

Tue Mar 10 07:25:17 2015 The RT System itself - Ticket #75497: Status changed from 'new' to 'open'

Tue Mar 10 07:25:26 2015 REHSACK [...] cpan.org - Ticket #75497: Merged into ticket #19024

Tue Mar 10 07:25:26 2015 REHSACK [...] cpan.org - Merged into ticket #19024

Wed Aug 23 05:55:50 2017 REHSACK [...] cpan.org - Correspondence added

I know it's a while open ... but can you guys check whether the qsort BLOCK, ARRAY function does the job for you? Please keep in mind - this will never work reasonably for pure-perl.

Wed Aug 23 17:06:11 2017 mschwern [...] cpan.org - Correspondence added

On Wed Aug 23 05:55:50 2017, REHSACK wrote:
Show quoted text

> I know it's a while open ... but can you guys check whether the qsort
> BLOCK, ARRAY function does the job for you?

That's a neat function, but my request for a "slide" function seems to have been lumped in here by mistake.

Wed Aug 23 17:15:59 2017 REHSACK [...] cpan.org - Correspondence added

On Wed Aug 23 17:06:11 2017, MSCHWERN wrote: Show quoted text

> On Wed Aug 23 05:55:50 2017, REHSACK wrote:

> > I know it's a while open ... but can you guys check whether the qsort > > BLOCK, ARRAY function does the job for you?

> > That's a neat function, but my request for a "slide" function seems to have > been lumped in here by mistake.

Oh yeah - but it looks cool. I'll put on on top of new functions ...