On 2008-January-22 , at 03:10 , Jon Erik Ween wrote: > That got me there. I suppose R prefers absolute field references in > scripts rather than macrosubstitutions of field names like you would > do in pearl or shell scripts?
no, actually, the problem is that apply works on arrays/matrices[1], not data.frames. So it converts the rows of your data.frame in an array instead of using a one row data.frame, hence you cannot refer to the elements of this array by name. This behavior has also bitten me several times and I would love to have an apply function that works on data.frames directly. Is there such a modified apply in some package? [1] ?apply says "If X is not an array but has a dimension attribute, apply attempts to coerce it to an array via as.matrix if it is two-dimensional (e.g., data frames) or via as.array." JiHO --- http://jo.irisson.free.fr/ ______________________________________________ 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.
