关于排序：按任意指定的顺序对R中的列名重新排序

Reorder column names in R by arbitrary specified order

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Possible Duplicate:
How to sort a dataframe by column(s) in R

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以下是数据集：

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odervect <- c("xaf","c3a","c3b","ka101","jk12","cd101","kl01v","klm1")
odervect
[1]"xaf""c3a" "c3b" "ka101""jk12" "cd101""kl01v""klm1"

dfd <- data.frame(ka101 = 101:110,c3a = 1:10, kl01v = 301:310, xaf = 11:20,
c3b = 41:50, cd101 = 61:70)

dfd

ka101 c3a kl01v xaf c3b cd101
1 101 1 301 11 41 61
2 102 2 302 12 42 62
3 103 3 303 13 43 63
4 104 4 304 14 44 64
5 105 5 305 15 45 65
6 106 6 306 16 46 66
7 107 7 307 17 47 67
8 108 8 308 18 48 68
9 109 9 309 19 49 69
10 110 10 310 20 50 70

期望输出：

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dfd1 <- data.frame(xaf = 11:20, c3a = 1:10, c3b = 41:50,ka101 = 101:110, cd101 = 61:70,
ka101v = 301:310)
dfd1
xaf c3a c3b ka101 cd101 ka101v
1 11 1 41 101 61 301
2 12 2 42 102 62 302
3 13 3 43 103 63 303
4 14 4 44 104 64 304
5 15 5 45 105 65 305
6 16 6 46 106 66 306
7 17 7 47 107 67 307
8 18 8 48 108 68 308
9 19 9 49 109 69 309
10 20 10 50 110 70 310

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请注意，并非顺序向量中的所有名称都存在于dfd中，但是只需要对匹配的名称进行排序。