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Re: Calculations while sorting?

From: Ben Pfaff
Subject: Re: Calculations while sorting?
Date: Sun, 27 Jul 2008 21:21:56 -0700
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.2 (gnu/linux)

John Darrington <address@hidden> writes:

> How feasible would it be to have sort_execute optionally calculate
> some simple linear statistics on the fly?  eg: the sum of values in
> one column.
> If that could be done, then it would avoid the need for an extra pass
> through the data for many procedures.

It would be easy to create a "moments_reader" that does calculations
like this as side effects and otherwise passes cases through
without modification.

There would be no need to make this part of sorting.  Just make a
"moments_reader" out of your data and then pass the
moments_reader to sort_execute.
Ben Pfaff

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