Hello, I have a set of one-liners (many thanks to previous responses from this list) that I use to look at newly imported data sets with functions like dim(), names(), str(), etc. within lapply(). Generally, these commands work for me but, I am apparently still missing some aspect of list manipulation. I don't understand why I get a set of NULL list elements at the end of each output as demonstrated below. How can I generate this (and similar) result(s) without all the trailing NULLs?
> lapply(ls(pattern='bn'), function(x) cat(x, dim(get(x)), "\t", names(get(x)), "\n")) bn1993 2885 11 oplt rplt rsiz tree bd ht oaz odst raz rdst spr bn1994 3158 7 oplt tree bd ht spr stat dam bn1995 734 7 oplt tree bd ht spr stat dam bn1996 293 7 oplt tree bd ht spr stat dam bn1997 264 7 oplt tree bd ht spr stat dam bn1998 768 7 oplt tree bd ht spr stat dam bn1999 654 7 oplt tree bd ht dbh stat dam bn2003 1407 9 oplt tree bd94 ht94 ht99 ht02 ht03 stat dam [[1]] NULL [[2]] NULL [[3]] NULL [[4]] NULL [[5]] NULL [[6]] NULL [[7]] NULL [[8]] NULL Thanx, DaveT. ************************************* Silviculture Data Analyst Ontario Forest Research Institute Ontario Ministry of Natural Resources [EMAIL PROTECTED] http://ofri.mnr.gov.on.ca ______________________________________________ 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.
