Dear friends,
I want to sort a dataset according to one or two variables in the dataset,
i thought sort could do it , but failed.
e.g.
x <- c(2, 9, 18, 3, 2)
y<-c(2,5.6,5,9,8)
z<-c(21,5,5,19,7)
a<-cbind(x,y,z)
a
x y z
[1,] 2 2.0 21
[2,] 9 5.6 5
[3,] 18 5.0 5
[4,] 3 9.0 19
[5,] 2 8.0 7
I want to sort dataset a according to ascending x and descending y, How to
accomplish it?
BTW, sort(a$x) can't works and it shows"null", why is it?
Any suggestions are welcome!
--
With Kind Regards,
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Zhi Jie,Zhang ,PHD
Tel:86-21-54237149 [EMAIL PROTECTED]
Dept. of Epidemiology,school of public health,Fudan University
Address:No. 138 Yi Xue Yuan Road,Shanghai,China
Postcode:200032
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