[R] How to sort TWO columns ?

[TEMPL Matthias]

Hi,

It would be discussed yesterday.

See e.g. in Google for ("sorting a data frame" R) http://www.r-project.org/nocvs/mail/r-help/2002/0088.html
Or one entry yesterday:

Best,
Matthias

>Hi

>Lets assign your data frame to the variable yourdf
>then:

>yourdf[ , order( yourdf$year ) ]

>should sort it.

>For decreasing increasing sorting
>see 
>?order

>Sincerely Eryk.



>*********** REPLY SEPARATOR  ***********

>On 20.07.2004 at 09:51 Luis Rideau Cruz wrote:

>Hi all
>
>I have the next data frame
>
>    year   STOD    SLAGNR  TAL TALT   TALVEKT
>1 2002  2120006     57      1      NA      1
>2 1997  97030032    57     NA   NA      NA
>3 1997  97030071    27     1      NA      NA
>4 1997  97030005    57     1      NA      NA
>5 1997  97020127    60     NA   1         NA
>6 2001  1160025     27      1      NA      1
>7 1998  98020069    60     1      NA      NA
>8 1996  96030009    57     NA   1         NA
>
>How to sort it according to "year" column
>Sort does seem to work only on vectors
>
>Thank you
>
>Luis Ridao Cruz
>Fiskirannsóknarstovan
>Nóatún 1
>P.O. Box 3051
>FR-110 Tórshavn
>Faroe Islands
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>

> 
> 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 ?
> 
> 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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