[R] Query about extracting subsets from a table

From: lalitha viswanath <lalithaviswanath_at_yahoo.com>
Date: Tue 23 Jan 2007 - 17:28:12 GMT

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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