Dear Monks,

I have two arrays of floating point numbers. One (@nums) contains the full-length version of these numbers. The other (@short_nums) contains these same numbers shortened to 10 deciimal places.

All i am trying to do is find the full-length numbers of a selection of short numbers that are held in a third array (@found). 

e.g. 
@nums = ('0.0989999999999', '0.6799999999999', '0.0859999999999', '0.0
+239999999999');

@short_nums = ('0.099', '0.68', '0.086', '0.024');


@found = ('0.099', '0.086');


if (defined ($found[0]))   {
     for (my $i =0; $i<@short_nums; $i++)  {

              if ($found[0] == $short_nums[$i])   {
                    push @new_array,  $nums[$i];
              }
     }
}

# etc ....

[download]
The problem is that sometimes more than one copy of the numbr is pushed into the array (e.g if two matching numbers in @nums are very similar like 0.005000000000007 and 0.005000000000008).

How can I ensure only one copy of each matching number is pushed into @new_array?? Thanks x

In reply to testing for numerical equality by Anonymous Monk

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