[R] reading in ASCII files
mark at myatt.demon.co.uk
Tue Sep 25 11:05:49 CEST 2001
Johann Petrak <johann at ai.univie.ac.at> writes:
>I wonder if there is a way to read in CSV files so that
>- certain fields within each record (line) are ignored, i.e.
> not converted to columns in the output data frame
You could write a bespoke function to do this using scan(). An internal
function or extension to read.table() might be useful but you can always
do that with whatever data-management tools you already use ... I use
EpiData (which allows you to drop variables when exporting to ASCII) and
DBMS/COPY which allows you to drop and recode during data transfer
>- factors/levels are created automatically: often, the possible
> labels are known in advance and could immediately be
> converted. This would save a lot of memory and time for
> bigger files, I assume.
You can use levels() and factor() to do this.
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