Re: [R] How to sort TWO columns ?

From: Uwe Ligges <ligges_at_statistik.uni-dortmund.de>
Date: Wed 21 Jul 2004 - 16:48:02 EST

Jacques VESLOT wrote:

> Dear ALL,
>
> I fear my question has already been answered many times before, but I
> haven't fund that in archives...
>
> I am working on spatial datasets and, in most arrays I'm handling, there are
> two columns dedicated to (x,y)-coords.
> For different reasons - notably to draw image() plots, I need to have these
> two columns sorted in increasing order.
> But sort() and order() seem to apply to vectors - or one single column -
> only.
>
> Could somedy please let me know how to sort two columns of a dataframe, with
> priority to one of them, just like in access ?

See ?order

Uwe Ligges

> Thanks,
>
> Jacques VESLOT
> CIRAD
>
> Another related question :
> How to put legend on image() plots - or image-based plots like
> image.kriging() in geoR ?
> Despite help pages, I haven't succeeded.
>
>
>
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https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Wed Jul 21 17:00:51 2004

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