On Fri, Oct 21, 2011 at 3:09 AM, kickout <[email protected]> wrote: > So i have a simple function: > > bmass=function(y){ > weight=y$WT*y$MSTR > return(bio) > }
But this just returns "bio" and since an object with that name is not defined in the function, it will be looked up in the global environment (workspace) and if it's not there either, you will get Error: object 'bio' not found. So even if you could fix the apply "issue" it would still not work. But Uwe Ligges showed you don't need apply to do what you seem to intend here, final$WT*final$MSTR should work. But if you do insist on apply for whatever reason then ... apply converts X (the first argument) to a matrix so you can't use the $ operator any more. The column names are preserved though, so what you could do is bmass <- function(y) y["WT"] * y["MSTR"] apply(final, 1, bmass) > And want to apply to a whole bunch of rows in my data.frame: > > final1=apply(final,1,yldbu) What is yldbu? I suppose you meant the function you defined above? Kenn > > > BUT...recieve the following error: > "Error in y$WT : $ operator is invalid for atomic vectors" > > > However when i try: >> final[1,]$WT*final[1,]$MSTR > [1] 156.3 > > > It gives me the correct answer....what is apply not liking in my code? > > Thanks > > > > -- > View this message in context: > http://r.789695.n4.nabble.com/Apply-giving-me-errors-tp3923880p3923880.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > [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. > ______________________________________________ [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.
