Dear Monks, I have a 120000 line text file called "chance.txt" containing two columns as below:

      k1 0.2
      k2 0.9
      k3 1
      k4 1.2
      k5 1.3
      k6 2
      k7 2.2
      k8 2.7
      k9 2.76
      k10 3.001
      k11 3.12
      k12 3.2
      k14 3.22
      k15 3.3
      k16 3.34
      k17 3.4
      k18 3.62
      k19 3.8
      k20 3.89
[download]

I have to print a random hash value and the associated key if it satisfies certain conditions shown below. Below is the code I wrote.

  #!/usr/bin/perl
  use strict;
  use warnings;

  my %netHash;
  my $capval;
  my ($capVal_1_Hash, $capVal_2_Hash, $capVal_1_Hash, ....., $capVal_9
+9_Hash, $capVal_1_Hash) ;
  

  open(IFH, "<", "./chance.txt");

  while(<IFH>) {
      chomp;
      my($nx,$ny) = split;
      $netHash{$nx} = $ny if ($ny > 1);
  }
  foreach $val (keys %netHash) {
    if($netHash{$val} > 1.0) {
     if($netHash{$val} < 1.4) {
         my ($x1, $y1) = ($val,$netHash{$val});
         $capVal_1_Hash{$x1} = $y1 if defined $y1;
      }
     }
     if($netHash{$val} > 1.4) {
     if($netHash{$val} < 1.9) {
         my ($x2, $y2) = ($val,$netHash{$val});
         $capVal_2_Hash{$x2} = $y2 if defined $y2;
      }
     }
     ...
     ...
    if($netHash{$val} > 99.2) {
     if($netHash{$val} <99.8) {
         my ($x99, $y99) = ($val,$netHash{$val});
         $capVal_99_Hash{$x99} = $y99 if defined $y99;
      }
     }
    if($netHash{$val} > 100.1) {
     if($netHash{$val} < 100.9) {
         my ($x100, $y100) = ($val,$netHash{$val});
         $capVal_100_Hash{$x100} = $y100 if defined $y100;
      }
     }


  }
    
   
 printHash(\%capVal_1_Hash);
 printHash(\%capVal_2_Hash);
 ...
 ...
 printHash(\%capVal_99_Hash);
 printHash(\%capVal_100_Hash);
 close IFH;
}


sub printHash {
    my $href = shift;
    my $RandKey = (keys %{$href}) [int(rand(scalar (keys %{$href})))];
    print "$RandKey $href->{$RandKey}\n";
 }
[download]

If I try to sample large files with this code, it looks like it is very slow. Therefore allow me to ask if there is any better way to write this code. Any help from fellow monks is appreciated.
best,
garbage777

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.