> -----Original Message----- > From: r-help-boun...@r-project.org > [mailto:r-help-boun...@r-project.org] On Behalf Of Jim Moon > Sent: Wednesday, December 22, 2010 5:05 PM > To: R-help@r-project.org > Subject: [R] with(data.frame,ifelse(___,___,___)) > > Hello, All, > > Mac OS 10.6.5 > R64 2.11.1 > > This works as expected: > > f1 = c(0.084, 0.099, 0) > data= data.frame(f1) > data$f1=with(data,ifelse(f1==0, 0.0001, f1)) > data > > f1 > 1 0.0840 > 2 0.0990 > 3 0.0001 > > Substituting 'f1==0' with 'T' produces the expected result: > > f1 = c(0.084, 0.099, 0) > data= data.frame(f1) > data$f1=with(data,ifelse(T, 0.0001, f1))
It produces those results accidently. Look at the output of the ifelse call, before you stuff it into data$f1: > ifelse(TRUE, 0.0001, data$f1) [1] 1e-04 The output of ifelse(condition,ifTrue,ifFalse) is the length of the condition argument and has nothing to do with the length of the ifTrue or ifFalse arguments. `$<-.data.frame`(x,name,value) will expand the value argument to the nrow(x). Bill Dunlap Spotfire, TIBCO Software wdunlap tibco.com > data > > f1 > 1 1e-04 > 2 1e-04 > 3 1e-04 > > But, substituting 'f1==0' or 'T' with 'F' does not produce > the expected result: > > f1 = c(0.084, 0.099, 0) > data= data.frame(f1) > data$f1=with(data,ifelse(F, 0.0001, f1)) > data > > f1 > 1 0.084 > 2 0.084 > 3 0.084 > > I would expect this: > f1 > 1 0.084 > 2 0.099 > 3 0 > > Is with(data.frame,ifelse(___,___,___)) broken, or does my > interpretation of it need fixing? > > Thank you for your time. > > Jim > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
