Appreciate it... //M
On 5. juni 2010, at 20.11, Joshua Wiley wrote: > On Sat, Jun 5, 2010 at 10:22 AM, moleps <mole...@gmail.com> wrote: >> thx. >> >> It was only the first instance that was class date. The rest were factors. >> So that explains it. >> >> If I want to change the rest in vec into class date (there are many of >> them...) >> >> neither as.Date(canc[,vec],"%d.%m.%Y") nor >> sapply(canc[,vec],FUN=function(x) as.date(x,"%d.%m.%Y")) works >> >> What is the easy solution to this? > > This is the nicest solution that comes to mind: > > as.data.frame(lapply(X=samp.dat, FUN=as.Date, format="%d.%m.%Y")) > > I believe the problem is that sapply() coerces the results (by default > when simplify=TRUE) using as.vector() leaving you with the number of > days since the origin. Anyway, using as.data.frame() on the list > output from lapply() seems to work. > > Josh > >> >> Regards, >> >> //M >> >> >> >> On 5. juni 2010, at 18.30, Joshua Wiley wrote: >> >>> Hello M, >>> >>> My guess is that it has something to do with the class of the >>> variables. Perhaps you could provide a small sample dataframe? Also >>> you might try running str() on your data frame and seeing if the >>> results are what you would expect. As a side note, it is not >>> necessary to make an anonymous function here, as you are allowed to >>> pass arguments to the function applied. >>> >>> apply(canc[,vec],1, min, na.rm=TRUE) >>> >>> Best regards, >>> >>> Josh >>> >>> On Sat, Jun 5, 2010 at 8:30 AM, moleps <mole...@gmail.com> wrote: >>>> I´m trying to tease out the minimum value from a row in a dataframe where >>>> all the variables are dates. >>>> >>>> apply(canc[,vec],1,function(x)min(x,na.rm=T)) >>>> >>>> >>>> However it only returns empty strings for the entire dataframe except for >>>> one date value (which is not the minimum date). >>>> >>>> I´ve also tried >>>> >>>> apply(canc[,vec],1,function(x)max(x,na.rm=T)) >>>> >>>> which provides values rowwise, but many of them are not in fact the >>>> largest in the row. >>>> >>>> >>>> Any advice? >>>> >>>> >>>> Regards, >>>> >>>> //M >>>> >>>> ______________________________________________ >>>> 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. >>>> >>> >>> >>> >>> -- >>> Joshua Wiley >>> Senior in Psychology >>> University of California, Riverside >>> http://www.joshuawiley.com/ >> >> > > > > -- > Joshua Wiley > Senior in Psychology > University of California, Riverside > http://www.joshuawiley.com/ ______________________________________________ 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.
