[R] Sorting

[jim holtman]

You might want to add a date column it you are planning to operate on
the data with dates:

> a  # your data
   X..1. X..2.
1    apr  1992
2    aug  1992
3    dec  1992
4    feb  1992
5    jan  1992
6    jul  1992
7    jun  1992
8    mar  1992
9    may  1992
10   nov  1992
11   oct  1992
12   sep  1992
13   apr  1993
14   aug  1993
15   dec  1993
16   feb  1993
17   jan  1993
18   jul  1993
19   jun  1993
20   mar  1993
21   may  1993
22   nov  1993
23   oct  1993
24   sep  1993
25   apr  1994
26   aug  1994
27   dec  1994
28   feb  1994
29   jan  1994
30   jul  1994
> # convert to date
> a$date <- as.Date(paste('1', a[[1]], a[[2]]), "%d %b %Y")
> a
   X..1. X..2.       date
1    apr  1992 1992-04-01
2    aug  1992 1992-08-01
3    dec  1992 1992-12-01
4    feb  1992 1992-02-01
5    jan  1992 1992-01-01
6    jul  1992 1992-07-01
7    jun  1992 1992-06-01
8    mar  1992 1992-03-01
9    may  1992 1992-05-01
10   nov  1992 1992-11-01
11   oct  1992 1992-10-01
12   sep  1992 1992-09-01
13   apr  1993 1993-04-01
14   aug  1993 1993-08-01
15   dec  1993 1993-12-01
16   feb  1993 1993-02-01
17   jan  1993 1993-01-01
18   jul  1993 1993-07-01
19   jun  1993 1993-06-01
20   mar  1993 1993-03-01
21   may  1993 1993-05-01
22   nov  1993 1993-11-01
23   oct  1993 1993-10-01
24   sep  1993 1993-09-01
25   apr  1994 1994-04-01
26   aug  1994 1994-08-01
27   dec  1994 1994-12-01
28   feb  1994 1994-02-01
29   jan  1994 1994-01-01
30   jul  1994 1994-07-01
> a[order(a$date),]
   X..1. X..2.       date
5    jan  1992 1992-01-01
4    feb  1992 1992-02-01
8    mar  1992 1992-03-01
1    apr  1992 1992-04-01
9    may  1992 1992-05-01
7    jun  1992 1992-06-01
6    jul  1992 1992-07-01
2    aug  1992 1992-08-01
12   sep  1992 1992-09-01
11   oct  1992 1992-10-01
10   nov  1992 1992-11-01
3    dec  1992 1992-12-01
17   jan  1993 1993-01-01
16   feb  1993 1993-02-01
20   mar  1993 1993-03-01
13   apr  1993 1993-04-01
21   may  1993 1993-05-01
19   jun  1993 1993-06-01
18   jul  1993 1993-07-01
14   aug  1993 1993-08-01
24   sep  1993 1993-09-01
23   oct  1993 1993-10-01
22   nov  1993 1993-11-01
15   dec  1993 1993-12-01
29   jan  1994 1994-01-01
28   feb  1994 1994-02-01
25   apr  1994 1994-04-01
30   jul  1994 1994-07-01
26   aug  1994 1994-08-01
27   dec  1994 1994-12-01
>


On Fri, Sep 11, 2009 at 9:46 AM, megh <megh700004 at yahoo.com> wrote:
>
> I have following object :
>
>> date2
>       [,1]  [,2]
>  [1,] "apr" "1992"
>  [2,] "aug" "1992"
>  [3,] "dec" "1992"
>  [4,] "feb" "1992"
>  [5,] "jan" "1992"
>  [6,] "jul" "1992"
>  [7,] "jun" "1992"
>  [8,] "mar" "1992"
>  [9,] "may" "1992"
>  [10,] "nov" "1992"
>  [11,] "oct" "1992"
>  [12,] "sep" "1992"
>  [13,] "apr" "1993"
>  [14,] "aug" "1993"
>  [15,] "dec" "1993"
>  [16,] "feb" "1993"
>  [17,] "jan" "1993"
>  [18,] "jul" "1993"
>  [19,] "jun" "1993"
>  [20,] "mar" "1993"
>  [21,] "may" "1993"
>  [22,] "nov" "1993"
>  [23,] "oct" "1993"
>  [24,] "sep" "1993"
>  [25,] "apr" "1994"
>  [26,] "aug" "1994"
>  [27,] "dec" "1994"
>  [28,] "feb" "1994"
>  [29,] "jan" "1994"
>  [30,] "jul" "1994"
>
> Now I want to sort the elements like below, and want to get the index
> numbers of "date2" under following sorting scheme.
>
> "jan" "1992"
> "feb" "1992"
> "mar" "1992"
> ............
> "dec" "1992"
> "jan" "1993"
> "feb" "1993"
> "mar" "1993"
> ............
> "dec" "1993"
> "jan" "1994"
> "feb" "1994"
> "mar" "1994"
> ............
> "dec" "1994"
>
> Can anyone help me please?
> --
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> Sent from the R help mailing list archive at Nabble.com.
>
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>



-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?