Re: [R] hash code for arbitrary object

From: Marc Schwartz <MSchwartz_at_mn.rr.com>
Date: Wed 03 Aug 2005 - 14:26:34 EST

On Wed, 2005-08-03 at 12:05 +0800, Adrian Baddeley wrote:
> Can anyone suggest a simple way to calculate a 'hash code'
> from an arbitrary R object?
>
> hash(x) should return an integer or string
> with the property that
> if hash(x) != hash(y) then x and y are not identical
> and the time to compute hash(x) should be quite short.
>
> Any suggestions welcome
> thanks
> Adrian Baddeley

Take a look at Dirk Eddelbuettel's digest() function in the package of the same name on CRAN. Be sure to read the details section for caveats regarding collisions.

HTH, Marc Schwartz



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