On Fri, 2009-04-03 at 11:45 -0700, rkevinbur...@charter.net wrote: > I have a list of data.frames > > > str(bins) > > List of 19217 > $ 100026:'data.frame': 1 obs. of 6 variables: > ..$ Sku : chr "100026" > ..$ Bin : chr "T149C" > ..$ Count: int 108 > ..$ X : int 20 > ..$ Y : int 149 > ..$ Z : chr "3" > $ 100030:'data.frame': 1 obs. of 6 variables: > ....... > As you can see one 'column' is "Count". This list seems to contain 19217 > data.frames. I would like to create an array of 19217 integers which hold the > values of the "Count" column. I have tried the obvious (to me): > > bins[[1:3]]$Count
sapply(bins, `[[`, "Count") will get you this as a vector. HTH G > But that returns NULL instead of an array of length 3 that I was > expecting. Interestingly bins[[1]]$Count returns the first "Count" in > the list of data frames. How do I get all of the "Count"s? > > Thank you. > > Kevin > > ______________________________________________ > 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. -- %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% Dr. Gavin Simpson [t] +44 (0)20 7679 0522 ECRC, UCL Geography, [f] +44 (0)20 7679 0565 Pearson Building, [e] gavin.simpsonATNOSPAMucl.ac.uk Gower Street, London [w] http://www.ucl.ac.uk/~ucfagls/ UK. WC1E 6BT. [w] http://www.freshwaters.org.uk %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%
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______________________________________________ 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.