[R] unique and precision of long integers

Mark Myatt mark at myatt.demon.co.uk
Wed May 16 10:38:19 CEST 2001

Michael Herron <mherron at latte.harvard.edu> writes:

>I have a dataset with about 500,000 observations, most of which are
>not unique.  The first 10 observations look like

[stuff deleted]

I can think of two methods that might work ...

        1. Scan as strings rather than numbers

        2. Scan in as separate fields and then do sum sort of checksum
        function on all variables and unique() on the checksum.

Hope that helps.


Mark Myatt

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