Consider:

file1
6.66 6.75
6.75 6.66
6.75 6.75
7.17 7.17
7.31 7.31
7.41 7.41

file2
6.75 6.66
6.75 6.75
7.17 7.17
7.31 7.31
7.41 7.41
6.62 6.75

[download]

which should generate:

6.62
6.66

[download]
Perl is Huffman encoded by design.

In reply to Re^2: comparing two arrays by GrandFather
in thread comparing two arrays by Anonymous Monk

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