Thank Dennis!!!.....it works....

regards

Gaurav Kumar
www.gauravkumar.org

PhD Student, Chemistry and Biomolecular Sciences, Macquarie , Sydney, Australia.
MS (Computational Biology), NCBS-TIFR, Bangalore, India.



--- On Wed, 20/1/10, Dennis Murphy <djmuser@gmail.com> wrote:

From: Dennis Murphy <djmuser@gmail.com>
Subject: Re: [R] R help for read.table()
To: gaurav@gauravkumar.org
Cc: r-help@r-project.org
Date: Wednesday, 20 January, 2010, 4:43 PM

R does vectorized arithmetic. Your loop was superfluous. Observe:

> x <- read.table(textConnection("
+ S:C 2.011085038928 
+ S:A 21.496800549900762 
+ S:J 0.183181039138149
+ P:E 9.641984304606304"))

> x
   V1         V2
1 S:C  2.0110850
2 S:A 21.4968005
3 S:J  0.1831810
4 P:E  9.6419843
> transform(x, pval = 2 * (1 - pnorm(abs(V2))))
   V1         V2       pval
1 S:C  2.0110850 0.04431648

2 S:A 21.4968005 0.00000000
3 S:J  0.1831810 0.85465597
4 P:E  9.6419843 0.00000000

HTH,
Dennis


On Wed, Jan 20, 2010 at 3:04 AM, Gaurav Kumar <gaurav@gauravkumar.org> wrote:





















I've a table containing two columns

seperated by space, as shown below.

S:C 2.011085038928



S:A 21.496800549900762



S:J 0.183181039138149



P:E 9.641984304606304









I'm reading this table inside a loop

but unable to access the first column as file[i,1].





file <-

read.table("data.txt",header=FALSE)



for ( i in 1:nrow(file))

{



 cat(file[i,1],":")



 pvalue <-

2*(1-pnorm(abs(file[i,2])))



 cat(pvalue,"\n")



}









can anyone help  me how to read the

first column.







regards





Gaurav Kumar

www.gauravkumar.org



PhD Student, Chemistry and Biomolecular Sciences, Macquarie , Sydney, Australia.

MS (Computational Biology), NCBS-TIFR, Bangalore, India.





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