[R] ordering columns in a data frame

[David Freedman]

I'm not sure what's incorrect about your result, but the following works:
d=data.frame(a=sample(letters[1:5],10,rep=T),b=rnorm(10),c=sample(1:10,10));
d
d[order(d$a,d$c),]

or, you can use orderBy:
lib(doBy)
orderBy(~a+b,data=d)  #use a - sign to sort in descending sequence

Did you leave off the tilde in your orderBy example?

hth
David Freedman, CDC Atlanta
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