Solved

Sychronized sorting?

Posted on 2002-05-07
7
195 Views
Last Modified: 2010-03-05
Hello, I have a list of users and their "points", however i have tried to come up with a sorting script (using bubble sort, eww...) a few times and have failed, can someone please show me an example script that would sort data that looks like this?

BTAnamedERIK:107
RonJonSSE:57
Oz7656:1
tkdman401:25
Sou1Tear:5
EZMONEY80:20
TkeMe2UrLeadr:11
deadphishphilay:3
AngelStr641:2
IronmanGus:1
BlInK182GuRl36k:12
cEDGabriel:3
PaPaloche:4
Infested2010:2
Danamajr:2
JeeStringDiva:1
MRitchie02:1
LilCGShuo2J:2
CGorg:1
Canivour:2
WutUpKneegroe:2
PoEbAbY3424:2
MusaUGA32:4
GreatGodlyOne:2

thank you very much.
0
Comment
Question by:PitViper
  • 4
  • 2
7 Comments
 
LVL 8

Expert Comment

by:bebonham
ID: 6994181
open IN, "datat.txt";  #this would be file containing data
@i=<IN>;

print "sorted alpha, case insensitive\n\n";
@o=sort {uc($a) cmp uc($b)} @i;
print @o;
print "\n\nthis is sorted by the number at the end";
@o=sort {substr($a,index($a,':')+1) <=> substr($b,index($b,':')+1)} @i;
print @o;
0
 
LVL 84

Expert Comment

by:ozo
ID: 6994217
In what order do you want them sorted?
0
 

Author Comment

by:PitViper
ID: 6994234
bebonham - the points are your if you can explain your answer a little, it works but thats some advanced code and i'm having a hard time dissecting it. Thanks :)
0
Live: Real-Time Solutions, Start Here

Receive instant 1:1 support from technology experts, using our real-time conversation and whiteboard interface. Your first 5 minutes are always free.

 
LVL 8

Accepted Solution

by:
bebonham earned 200 total points
ID: 6994260
sorting is easy once you get the hang of it.

first:

sort works like this

@sorted_list=sort {comparison} @list_to_sort;

the default sort is alpha, and case sensitive.

perl uses $a and $b as references to each of the sets of two items that get compared.

so, @output= sort {$a <=> $b} @input;

would numerically sort @input into @output.

this line here,
@o=sort {substr($a,index($a,':')+1) <=> substr($b,index($b,':')+1)} @i;

takes whatever is after the ':' (substr($a,index($a,':')+1))

and compares it against the same from item two - substr($b,index($b,':')+1)


the part about {uc($a) cmp uc($b)} just converts the data to upper case, so the comparison is case sensitive.
keep in mind, anything you do to the list in the sort subroutine doesn't modify the actual data, it only tells sort what order to put it in.
 
if you have other questions, please look here
http://www.perldoc.com/perl5.6.1/pod/func/sort.html

thanks,

Bob
0
 
LVL 8

Expert Comment

by:bebonham
ID: 6994263
correction....this
"the part about {uc($a) cmp uc($b)} just converts the data to upper case, so the comparison is case sensitive.
keep in mind, anything you do to the list in the sort subroutine doesn't modify "

should say the it makes the comparision NOT case sensitive
0
 

Author Comment

by:PitViper
ID: 6994295
thanks, is it possible to get it into a hash with eaze? i.e. $mypoints{$name}, would make life a lot easier :) thanks again.
0
 
LVL 8

Expert Comment

by:bebonham
ID: 6994367
heck yeah!!

, but keep in mind then it isn't sorted anymore...


open IN, "datat.txt";
@i=<IN>;

foreach(@i)
{
chomp($myPoints{substr($_,0,index($_,':'))}=substr($_,index($_,':')+1));
}
@k=keys %myPoints;
foreach(@k)
{
print "this dude " . $_ . " he has " . $myPoints{$_} . " points.\n";
}


0

Featured Post

Live: Real-Time Solutions, Start Here

Receive instant 1:1 support from technology experts, using our real-time conversation and whiteboard interface. Your first 5 minutes are always free.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Email validation in proper way is  very important validation required in any web pages. This code is self explainable except that Regular Expression which I used for pattern matching. I originally published as a thread on my website : http://www…
Checking the Alert Log in AWS RDS Oracle can be a pain through their user interface.  I made a script to download the Alert Log, look for errors, and email me the trace files.  In this article I'll describe what I did and share my script.
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…
Sending a Secure fax is easy with eFax Corporate (http://www.enterprise.efax.com). First, just open a new email message. In the To field, type your recipient's fax number @efaxsend.com. You can even send a secure international fax — just include t…

813 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

15 Experts available now in Live!

Get 1:1 Help Now