Hi

I do not know if this will help and also don't know if this will be faster, but I would try to use a different data structure: a hash of arrays with each array containing 3 elements: the interval lower limit, the interval upper limit and the tag count.

As a (very light) proof of concept, I will simplify the problem by simply forgetting about the a, b et so on, but just using a simple list of ranges. Or, if you prefer, I will deal only with your data related to letter a. Since I do not understand what your tags are about, I will just add 1 to the count when the value of the variable falls within the range.

This gives me the following session under the Perl debugger: 

  DB<49> @c = ([12,15], [12,17], [13,14], [14,19])

  DB<50> x @c
0  ARRAY(0x20498b98)
   0  12
   1  15
1  ARRAY(0x20499588)
   0  12
   1  17
2  ARRAY(0x2049c428)
   0  13
   1  14
3  ARRAY(0x2049c488)
   0  14
   1  19
  DB<51> $e = 17

  DB<52> $_->[2]++ foreach grep {$e <= $_->[1]} grep {$e >= $_->[0]} @
+c

  DB<53> x @c
0  ARRAY(0x20498b98)
   0  12
   1  15
1  ARRAY(0x20499588)
   0  12
   1  17
   2  1
2  ARRAY(0x2049c428)
   0  13
   1  14
3  ARRAY(0x2049c488)
   0  14
   1  19
   2  1
  DB<54> $e = 13;

  DB<55> $_->[2]++ foreach grep {$e <= $_->[1]} grep {$e >= $_->[0]} @
+c

  DB<56> x @c
0  ARRAY(0x20498b98)
   0  12
   1  15
   2  1
1  ARRAY(0x20499588)
   0  12
   1  17
   2  2
2  ARRAY(0x2049c428)
   0  13
   1  14
   2  1
3  ARRAY(0x2049c488)
   0  14
   1  19
   2  1
  DB<57>

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In reply to Re: Counter - number of tags per interval by Laurent_R
in thread Counter - number of tags per interval by baxy77bax

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