[R] How to sort TWO columns ?

[Jacques VESLOT]

Sorry sorry,
I didn't pay enough attention to order() help pages indeed...
and it costs me much useless indexing.

As concerns how to put legend in image() plot, is there a piece of
information about somewhere ?
thanks a lot for helping,

Jacques VESLOT







-----Message d'origine-----
De : Uwe Ligges [mailto:ligges at statistik.uni-dortmund.de]
Envoyé : mercredi 21 juillet 2004 10:48
À : jacques.veslot at cirad.fr
Cc : r-help at stat.math.ethz.ch
Objet : Re: [R] How to sort TWO columns ?


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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