How can i file this isssue as an bugreport? On Fri, Feb 03, 2012 at 02:01:02PM +0100, peter dalgaard wrote: > > On Feb 2, 2012, at 21:24 , Frank Schwidom wrote: > > > Hi, > > > > the following Code demonstrates an possibly Error in R > > (or you can explain me, why this happens, thanks in advance) > > Looks like an effect of lazy evaluation: The value of i is not evaluated > until after the loop has ended, at which point it will be 2. This is a > feature, not an error, even if it confuses people at times... > > -pd > > > > > > Code: > > > > ##################################### > > > > testClass <- function( stackData= c()) > > { > > > > list( > > > > write= function( ...) > > { > > sChain= "" > > for( s in c( stackData, ...)) > > { > > sChain= paste( sChain, '"', sub( '"', '\\\\"', s), '"', sep, sep='') > > } > > write( sChain, fHandle, append=TRUE) > > }, > > > > stackIt1 = function( ...) > > { > > testClass( stackData= c( stackData, ...)) > > }, > > > > stackIt2 = function( ...) > > { > > tmp= c( stackData, ...) > > testClass( stackData= tmp) > > }, > > > > getStack = function() > > { > > stackData > > }, > > > > NULL > > ) > > } > > > > to1= testClass() > > > > for( i in 4:2) > > { > > to1= to1$stackIt1( i) > > } > > > > print( all( rep( 2, 3) == to1$getStack())) # error! > > > > to2= testClass() > > > > for( i in 4:2) > > { > > to2= to2$stackIt2( i) > > } > > > > print( all( 4:2 == to2$getStack())) # correct! > > > > # what ist the difference between stackIt1 and stackIt2? > > # (error appears only by using an for loop) > > > > " > >> version > > _ > > platform i486-pc-linux-gnu > > arch i486 > > os linux-gnu > > system i486, linux-gnu > > status > > major 2 > > minor 12.1 > > year 2010 > > month 12 > > day 16 > > svn rev 53855 > > language R > > version.string R version 2.12.1 (2010-12-16) > > > > Regards > > " > > > > ##################################### End of Code > > > > written in an R-File and called per source( '<Fname>.R') > > shows 2 subsequent outputs of 'TRUE', which is not ok > > in my mind > > > > Thanks for your attention > > > > ______________________________________________ > > 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. > > -- > Peter Dalgaard, Professor > Center for Statistics, Copenhagen Business School > Solbjerg Plads 3, 2000 Frederiksberg, Denmark > Phone: (+45)38153501 > Email: pd....@cbs.dk Priv: pda...@gmail.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.