Hi! Better then a cookbook. http://www.ku.edu/~pauljohn/R/Rtips.html
/E Ps. *********** REPLY SEPARATOR *********** On 9/16/2004 at 1:55 PM Dan Bolser wrote: >>>Minter! >>> >>>Is there an R cookbook? which lists this kind of common problem and >>>common >>>solution? >>> >>> >>>On Thu, 16 Sep 2004, Dimitris Rizopoulos wrote: >>> >>>>Hi Dan, >>>> >>>>do you need something like that, >>>> >>>>dat <- data.frame(V1=rnorm(40000, 10), V2=rnorm(40000, 10)) >>>>ratioV1V2 <- ifelse(dat$V1>dat$V2, dat$V1/dat$V2, dat$V2/dat$V1) >>>> >>>>I hope it helps. >>>> >>>>Best, >>>>Dimitris >>>> >>>>---- >>>>Dimitris Rizopoulos >>>>Ph.D. Student >>>>Biostatistical Centre >>>>School of Public Health >>>>Catholic University of Leuven >>>> >>>>Address: Kapucijnenvoer 35, Leuven, Belgium >>>>Tel: +32/16/396887 >>>>Fax: +32/16/337015 >>>>Web: http://www.med.kuleuven.ac.be/biostat/ >>>> http://www.student.kuleuven.ac.be/~m0390867/dimitris.htm >>>> >>>>----- Original Message ----- >>>>From: "Dan Bolser" <[EMAIL PROTECTED]> >>>>To: <[EMAIL PROTECTED]> >>>>Sent: Thursday, September 16, 2004 2:19 PM >>>>Subject: [R] Conditionally swap two columns of a data.frame? >>>> >>>> >>>>> >>>>> I am doing this a kinda dumb way, and it is apparetnly taking >>>>> forever. >>>>> >>>>> I have a data frame with two numeric columns. I want to look at >>>>their >>>>> correlation, and I am looking at the size ratio between the two. >>>>> >>>>> i.e. >>>>> >>>>> plot(density(data$V1/data$V2)) >>>>> >>>>> This kinda gives me a normal curve showing something about the >>>>> distribution of the two values. >>>>> >>>>> I want to make sure that V1/V2 is always > 1 ... >>>>> >>>>> for (i in 1:length(row.names(data)) ){ >>>>> ratioV1V2 <- if(V1>V2) V1/V2 else V2/V1 >>>>> } >>>>> >>>>> This is a bit of a hack, and is taking forever for some reson (about >>>>> 40,000 rows in my data.frame). >>>>> >>>>> I would just like to swap the values in the data frame (to put the >>>>bigest >>>>> first for example), then use the above plot to get what I want. >>>>> >>>>> Should I use the DB backend to the data to make the dump in this >>>>way? >>>>> (involves some hacky sql) >>>>> >>>>> Considering I am interested in the range of the ratio between V1 and >>>>V2, >>>>> should I be looking at doing a different analysis? >>>>> >>>>> I am so dumb, any help is appreciated, >>>>> >>>>> Dan. >>>>> >>>>> ______________________________________________ >>>>> [EMAIL PROTECTED] mailing list >>>>> https://stat.ethz.ch/mailman/listinfo/r-help >>>>> PLEASE do read the posting guide! >>>>http://www.R-project.org/posting-guide.html >>>>> >>>> >>> >>>______________________________________________ >>>[EMAIL PROTECTED] mailing list >>>https://stat.ethz.ch/mailman/listinfo/r-help >>>PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Dipl. bio-chem. Witold Eryk Wolski @ MPI-Moleculare Genetic Ihnestrasse 63-73 14195 Berlin 'v' tel: 0049-30-83875219 / \ mail: [EMAIL PROTECTED] ---W-W---- http://www.molgen.mpg.de/~wolski [EMAIL PROTECTED] ______________________________________________ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html