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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