R help - Mar 2011 - Resending the mail - Ordering data.frame based on some class

Dear R helpers

I am resending my mail as the output I desire was not properly visible and I
apologize for the same.

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

Regards

Vincy


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