On Mon, Jun 20, 2016 at 10:40 AM, Shlomi Fish <shlo...@shlomifish.org> wrote:
> Hi Chris,
>
> On Mon, 20 Jun 2016 11:28:57 -0600
> Chris Fedde <ch...@fedde.us> wrote:
>
>> Kenneth,
>>
>> Below the cut is my example implementation as I understand your
>> requirements.
>> Note that the "compare" routine uses $a and $b which are "special" to perl
>> sort routines.
>> Also the compare routine is written for obviousness rather than for brevity
>> or elegance.
>>
>> The return from compare illustrates Shalomi Fish's point about using the
>> "||" operator to compose sort fields.
>> Descending numeric order is done by reversing the comparison on that sub
>> field.
>>
>
> Thanks for the illustrative example! I was too lazy to write one.
>
> Regards,
>
> Shlomi Fish
>
>
>> chris
>>
>> ----- cut -----
>> #!/usr/env/bin perl
>>
>> use strict;
>> use warnings;
>>
>> my @x = <DATA>;
>>
>> sub compare {
>> my @a = split(/\t/, $a);
>> my @b = split(/\t/, $b);
>> return $b[0] <=> $a[0] || $a[1] cmp $b[1]
>> }
>>
>> print for (sort {compare} @x);
>>
>> __DATA__
>> 9500 ohzaew
>> 5300 dohpha
>> 0700 liemah
>> 1700 phuhei
>> 0200 phuowo
>> 1300 ojaeng
>> 3900 aebaat
>> 4200 dohgha
>> 4200 aiyiej
>> 6300 ojaeng
>> 1600 haequa
>> 3100 hupiez
>> 3200 ahrieb
>> 3600 ohzaew
>> 5300 queebe
>> 2000 oeyael
>> 0200 hahwoo
>> 9900 shahye
>> 9300 johhir
>> 6400 shahye
>> 4500 ohfici
>> 5500 ahngoh
>> 7300 aibove
>> 8200 ahrieb
>> 9100 ohzaew
>> 3100 ohzaew
>> 2800 gahnoh
>> 0800 aedeng
>> 8400 oowaih
>> 0300 vouroh
>> 1400 shahye
>> 0500 ciejee
>> 0500 uanahp
>> 2100 ophuum
>> 1500 aideev
>> 6900 aegeuw
>> 6300 haequa
>> 9300 queebe
>> 5400 reogai
>> 5000 ophuum
>> 1700 aebaat
>> 1600 eshida
>> 3700 beidae
>> 5200 quieki
>> 6800 eashoo
>> 6800 ohweba
>> 2300 apahqu
>> 8100 ahghee
>> 6700 jooxoj
>> 3500 yeiboo
>> 2800 chuema
Thank you so much!
Now I've got to study this and experiment until it becomes natural.
Meanwhile, I studied what was on line 43 of the perldoc sort page and
decided to try to use that and modify it.
I took out the equals sign and then I took out the second stanza.
It seems to work:
@sorted_summary_detail = sort {($b =~ /(\d+)/)[0] <=> ($a =~
/(\d+)/)[0]} @summary_detail;
Again, thank you; I have to study this.
Ken Wolcott
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