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casereader numbering

From: John Darrington
Subject: casereader numbering
Date: Thu, 17 Jul 2008 19:31:30 +0800
User-agent: Mutt/1.5.18 (2008-05-17)

I've started  rewriting EXAMINE to make it less crappy.

One thing that would make it easier would be a function of the form

 struct casereader * append_case_numbers (struct casereader *cr);

which returns a new casereader which is identical to CR except that it
has one extra column which contains the ordinal number of each case.

For example if CR contains

x y
z .
a b
c d

the return will contain

x y 1
z . 2
a b 3
c d 4

Such a function would also simply the implementation of RANK.  But
it's not obvious to me how to create such a function.

Is this a feasible thing to do?


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