another question about finding duplicates

jbv jbv.silences at club-internet.fr
Sun Jan 27 08:05:14 EST 2008



Peter,

I've tried that approach and found that in case of huge amount of data,
it can beslower (because of the sort function) that the method posted
before, the one including 2 loops and the use of arrays.

JB


> There's a file which goes roughly:
>
> 1       anything
> 2       anything
> 3       anything
> 4       anything
>
> etc
>
> It can always be sorted by the first item.  Sometimes a duplicate entry will
> creep in, so the file will look
>
> 1       anything
> 2       anything
> 2       anything
> 3       anything
> 4       anything
>
> or perhaps
>
> 1       anything
> 2       anything
> 3       anything
> 3       anything
> 4       anything
>
> What's the quickest way of checking for this condition  - when the two items 1
> of any two adjacent lines are identical?  I have found a brute force way to
> do it using filter, but it is really clunky and slow.
>
> Cheers
>
> Peter
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