[R] sorting data frame

[Patrick E. McKnight]

Thomas and Andy,

Thanks for the quick replies.  The suggestions did the trick.  Andy's 
code was exactly what I needed but I see how Thomas' code will help to 
eliminate a step in my function.  Thanks to both of you for your help.

Cheers,

Patrick

Thomas Lumley wrote:

> 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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Cheers,

Patrick

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