Very good points :-)
> - colClasses() in R.utils is similar, except for the particular codes and
> classes supported, to expandClasses() here.
In fact I saw colClasses() once and got the idea from it, but when I needed the
functionallity I did not remember where had I seen it and rewrote it. Now with
your hint I can reuse colClasses() instead. I also use a similar function to
facilitate writting long logical vectors: expandLogical("TFTFNFFFTN")
So, with your suggestions:
> x <- data.frame(X="2008-01-01", Y=1.1:3.1, Z=letters[1:3])
> data.frame(mapply(function(x, class) match.fun(paste("as", class,
> sep="."))(x), x, colClasses("Dif"), SIMPLIFY=FALSE), stringsAsFactors=FALSE)
Enrique
-----Original Message-----
From: Gabor Grothendieck [mailto:ggrothendi...@gmail.com]
Sent: jueves, 25 de junio de 2009 13:41
To: Bengoechea Bartolomé Enrique (SIES 73)
Cc: r-help@r-project.org; mtb...@gmail.com
Subject: Re: [R] Apply as.factor (or as.numeric etc) to multiple columns
That's quite nice. Three comments:
- colClasses() in R.utils is similar, except for the particular codes and
classes supported, to expandClasses() here.
- not sure if this is important but if as() were the last possibility tried
rather than the first then in most cases (in fact all cases handled by
expandClasses() ) there would be no use of the methods package.
- paste("as", ...) handles all the common cases including all cases handled by
expandClasses() except NA_character_ and could be used as a poor man's
doCoerce().
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