Beautiful! Thanks Jim. DaveT. >-----Original Message----- >From: jim holtman [mailto:[EMAIL PROTECTED] >Sent: May 6, 2008 07:33 PM >To: Thompson, David (MNR) >Subject: Re: [R] list manipulation > >The reason for the NULLs is that is the output of the lapply you are >executing. If you don't want to see the value, then use 'invisible' >or assign to an object since you are executing this at the command >level, the default is to print the value. > >invisible(lapply(...)) > >On Tue, May 6, 2008 at 2:35 PM, Thompson, David (MNR) ><[EMAIL PROTECTED]> wrote: >> 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. >> > > > >-- >Jim Holtman >Cincinnati, OH >+1 513 646 9390 > >What is the problem you are trying to solve? >
______________________________________________ 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.
