If I understand correctly your question, you can try something about like this:
# Access all elements named 'V1' in your list lapply(test, lapply, '[', 'V1') On Tue, Aug 11, 2009 at 3:49 PM, Bryan Hanson <[email protected]> wrote: > Hello Again R Folks: > > I¹m trying to clean up some code. Suppose I have an object like this: > > > str(test) > List of 2 > $ G:List of 2 > ..$ cls:'data.frame': 101 obs. of 2 variables: > .. ..$ V1: num [1:101] -0.0019 -0.0019 -0.00189 -0.00188 -0.00186 ... > .. ..$ V2: num [1:101] 0.000206 0.000247 0.000288 0.000329 0.000371 ... > ..$ rob:'data.frame': 101 obs. of 2 variables: > .. ..$ V1: num [1:101] -0.00142 -0.00141 -0.0014 -0.00139 -0.00137 ... > .. ..$ V2: num [1:101] 0.000424 0.000456 0.000487 0.000517 0.000546 ... > $ T:List of 2 > ..$ cls:'data.frame': 101 obs. of 2 variables: > .. ..$ V1: num [1:101] -0.00222 -0.00222 -0.00221 -0.00219 -0.00216 ... > .. ..$ V2: num [1:101] -0.00077 -0.000742 -0.000712 -0.000681 -0.000648 > .. > ..$ rob:'data.frame': 101 obs. of 2 variables: > .. ..$ V1: num [1:101] -0.000981 -0.000979 -0.000972 -0.000961 -0.000946 > .. > .. ..$ V2: num [1:101] -0.000332 -0.000303 -0.000274 -0.000245 -0.000216 > .. > > I need to perform some operations on each value of V1 in turn, then each > value of V2 in turn (so for instance I want test$G$cls$V1). The structure > of this object is nearly constant except the first elements of the list (G, > T in the example) may vary in number and name, so I need something that > accommodates this. > > I can do this with loops, but it seems like a job for lapply or rapply, but > these don't quite work. I've played with quite a few variations, searched > the help archives and found a number of useful ideas, but not quite what I > need. The only thing that nearly works is do.call(cbind, object) enough > times to bring V1 and V2 "to the surface" but then I've lost my carefully > constructed naming. > > Any suggestions appreciated. It seems like there might be a simple > approach, but I may be too tired right now to see it! > > Thanks, Bryan > ************* > Bryan Hanson > Professor of Chemistry & Biochemistry > DePauw University, Greencastle IN USA > > ______________________________________________ > [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 > and provide commented, minimal, self-contained, reproducible code. > -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O [[alternative HTML version deleted]]
______________________________________________ [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 and provide commented, minimal, self-contained, reproducible code.
