[R] Ordering data.frame based on class

[Henrique Dallazuanna]

Try this:

my_dat[order(my_dat$class, -my_dat$var1, decreasing = TRUE),]

On Mon, Mar 28, 2011 at 5:55 PM, Vincy Pyne <vincy_pyne at yahoo.ca> wrote:
> Dear R helpers
>
> Suppose I have a data.frame as given below -
>
> my_dat = data.frame(class = c("XYZ", "XYZ", "XYZ", "XYZ", "XYZ","ABC", "ABC", "ABC", "ABC", "ABC" ),  var1 = c(20, 14, 89, 81, 17, 44, 36, 41, 11, 36), var2 = c(1001, 250, 456, 740, 380, 641, 111, 209, 830, 920))
>
>> my_dat
>    class var1 var2
> 1    XYZ   20 1001
> 2    XYZ   14  250
> 3    XYZ   89  456
> 4    XYZ   81  740
> 5    XYZ   17  380
> 6    ABC   44  641
> 7    ABC   36  111
> 8    ABC   41  209
> 9    ABC   11
>  830
> 10   ABC  20  920
>
> I wish to sort above data.frame class-wise on var1. Thus, Ineed to get
>
>
> class                    var1        var2
>
>
>
>  XYZ
>  14
>  250
>
>
>  XYZ
>  17
>  380
>
>
>  XYZ
>  20
>  1001
>
>
>  XYZ
>  81
>  740
>
>
>  XYZ
>  89
>  456
>
>
>  ABC
>  11
>  830
>
>
>  ABC
>  20
>  920
>
>
>  ABC
>  36
>  111
>
>
>  ABC
>  41
>  209
>
>
>  ABC
>  44
>  641
>
>
> Kindly guide
>
> Vincy
>
>
>
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>
>
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>
>



-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O