[R] How to sort TWO columns ?

[Uwe Ligges]

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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