[R] sorting data frame

[Thomas Lumley]

On Fri, 4 Jan 2002, Patrick E. McKnight wrote:

> Greetings,
>
> I hope this isn't obvious but I've read through the FAQ and the various
> other R/S books I have and I cannot, for the life of me, figure out how
> to sort a data frame by a specific variable.  Suppose I have a four
> variable data.frame x and the variables are var1, var2, var3, var4.  I
> want to sort on say var3 simply for display purposes.  How can this be
> accomplished?  Thanks in advance for any hints, RTFM (the exact one
> please), or any other useful pointers.
>


You want the order() function, which returns a permutation that can be
used to reorder

Eg, to plot points on a curve in increasing order so they can be connected
with lines

  oo<-order(x)
  plot(x[oo],y[oo],type="l")


	-thomas


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