[R] Query about extracting subsets from a table
ccleland at optonline.net
Tue Jan 23 18:37:15 CET 2007
lalitha viswanath wrote:
> 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];
Firstly, don't call your matrix 'matrix'. Would you call your dog 'dog'?
Anyway, it might clash with the function 'matrix'.
-- Barry Rowlingson
R-help (October 2004)
> I would like to use this pruned list of escores to get
> the corresponding genomenames and treedist.
df.sub <- subset(df, log10escore < -3)
> 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.
> Food fight? Enjoy some healthy debate
> R-help at stat.math.ethz.ch mailing list
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
Chuck Cleland, Ph.D.
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