Re^4: to loop through an array

Ahh, I misunderstood your spec. Rather than just accumulating with push, you would be better served with a hash. In this case, you could accumulate frequencies with something like:

my %count;
for my $element (@findle)
         {
    if (/\Q$element\E/ ) {
        print "$_\n";
        $number++;
       #  push @hit $element;
         $count{$element}++;

        #@lines =
   # print ("there are : " . $number);


      }
    
  }
for my $element (@findle) {
    print "$element\t=>$count{$element}\n";
}
[download]

Hashes are probably Perl's greatest strength. A read through of perldata will tell you a bit more about them.

Comment on Re^4: to loop through an array Download Code

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Re^5: to loop through an array by alexlearn (Initiate) on May 13, 2011 at 20:42 UTC
I am not sure I fully understand the data that is being printed. print "$element\t=>$count{$element}\n"; I seem to getting a strange error Use of uninitialized value in concatenation (.) or string at searchfile.pl line 91, <FILE> line 1023078. Is there a problem with the hash and how its counting the elements	[reply]
Re^6: to loop through an array by kennethk (Abbot) on May 16, 2011 at 14:11 UTC
There are two possibilities I see here. First, you may not be assigning anything to $_. If you are not getting any numerical output, this is your issue. Second, if not every key gets hit, then some elements will never be initialized. You can fix this either by initializing all elements in `%count` to zero before the loop (`$count{$_} = 0 for @findle;`) or limit your output to cycling over keys where you got hits: `for my $element (sort keys %count) { print "$element\t=>$count{$element}\n"; }` [download]	[reply] [d/l] [select]