Re: [R] Query about extracting subsets from a table

From: Chuck Cleland <ccleland_at_optonline.net>
Date: Tue 23 Jan 2007 - 17:37:15 GMT

lalitha viswanath wrote:
> Hi
> 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];

> library(fortunes)
> fortune("dog")

Firstly, don't call your matrix 'matrix'. Would you call your dog 'dog'? Anyway, it might clash with the function 'matrix'.

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

?subset

df.sub <- subset(df, log10escore < -3)

summary(df.sub)

> 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.
>
> Thanks
> L
>
>
>
> ____________________________________________________________________________________
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>
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-- 
Chuck Cleland, Ph.D.
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Received on Wed Jan 24 04:52:32 2007

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