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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