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st: How to append a dataset using one observation only


From   tiago.pereira@incor.usp.br
To   statalist@hsphsun2.harvard.edu
Subject   st: How to append a dataset using one observation only
Date   Fri, 16 Nov 2007 00:51:33 -0200 (BRT)

Dear Statalisters,

Due to problems with memory, I would like to know if it is possible to
append a dataset only using a specific observation.

For example, suppose we have the following datasets:

DATASET 01

variable1
1
2
3
4
5
6


DATASET 02

variable1
4
45
12
56
28

The objective is to add to dataset 01 only one out of 5 observations of
dataset 02 without creating a tempfile.

I am trying to implement tests used in genetics, in which each column is a
sequence of DNA, coded as 0,1,2 and 3. It seems that Stata cannot handle
well with such tests, since all memmory is rapidly consumed (~1 GB for a
relatively short segment of DNA analyzed for 10 or more subjects). Why
does Stata load everything into memory?

All the best,

Tiago


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