[R] How to sort TWO columns ?

[Uwe Ligges]

Jacques VESLOT wrote:

> 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
> 

In the same way as in usual plots.
Note that filled.contour() might be another choice of such a plot that 
already plots a legend ...

Uwe Ligges


> 
> 
> 
> 
> 
> -----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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