Rules
1. sub must take 2 params:
1) list (or listref) of _numerical_ data (minimum 1 element)
2) a number - int/real/negative - whatever! as the "match-closest-to-this" number
not necessarily in that order.
2. the original order of the data must be maintained - you can't sort the data directly.
3. can't think of any more!
Update: 19:45 29/05/2001 (GMT)
Apologies if I did not make this clear: 2 things go into the sub - a number and a list. the order in which you pass these is up to you. the list can either go in as a strtaight list or as a reference to a list - your choice - just so long as the original isn't modified. and the return value from the sub should be either the value closest to the given number or the index in the original list.
e.g.
sub g {blah} print "Closest value is ",g(@list,$number); # or print "Closest value is ",g($number,@list); # or print "Closest value is ",g(\@list,$number); # or print "Closest value is ",g($number,\@list); # OR print "Closest value is ",$list[g(@list,$number)]; # or print "Closest value is ",$list[g($number,@list)]; # or print "Closest value is ",$list[g(\@list,$number)]; # or print "Closest value is ",$list[g($number,\@list)];
I can't believe I had to leave a space in!#!perl -w use strict; chomp(my @list = <DATA>); # FORE!!! 78 chars. sub g {my%h=();my$n=pop;$h{abs($_-$n)}=$_ for@_;my@s=sort{$a<=>$b}keys +%h;$h{shift@s};} print g(@list,10); __DATA__ 17 1.4 18.2 7.9 12.2 12.5 1.1 7.8 18.3 20 6.7 6.9 18.1 1.5 17.7 16.6 1.2 1.3 17.5
"Argument is futile - you will be ignorralated!"