[R] Arguments to order()

From: David Neu <david_at_davidneu.com>
Date: Sat, 23 Apr 2011 14:00:30 -0400


Hi,

The rows of a data frame can be sorted lexicographically as shown in this example,

my.df <- data.frame(x=c(1,1,1,2,2), y=c(1,2,3,2,1)) my.df[order(my.df$x,my.df$y, decreasing=TRUE), ]

however, I'm wondering if it's possible to pass a variable in as the first argument to order() so that the actual set of columns used in the sort can be easily varied?

FWIW, the first argument to order() is of type "..." and page 2 of R Language Manual says that "Users cannot easily get hold of objects of" this type.

Many thanks for any ideas!

Cheers,
Dave



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