[R] Query about extracting subsets from a table

lalitha viswanath lalithaviswanath at yahoo.com
Tue Jan 23 18:28:12 CET 2007

I am trying to process tabular data as follows:

Data in the input file is of the form

genome1 genome2 tree-dist log10escore

Genome1 and genome2 are alphabetic.
Tree-dist and log10escore are numeric.

I wish to extract only those  rows from this table
where the log10escore is less than -3.

data <-read.table(filename);
data$log10escore = data$log10escore[ data$log10escore
< -3];

I would like to use this pruned list of escores to get
the corresponding genomenames and treedist.

I did not find anything useful in the FAQs and Notes
on R for this part of the data extraction.

As I am just beginning programming in R, I would
appreciate your input about this.


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