r - 如何对组内的数据进行排序并计算R中每个组的元素？

Question

可能重复：
如何在 R 中按列对数据框进行排序

大家：我想使用R对组内的数据进行排序。例如：数据是：

geneID  Nr.annotation
CL1002  uncharacterized
CL1002  uncharacterized
CL1002  uncharacterized
CL1002  uncharacterized
CL1002  uncharacterized
CL1002  uncharacterized
CL1019  PREDICTED:
CL1019  PREDICTED:
CL1019  predicted
CL1019  PREDICTED:
CL1019  PREDICTED:
CL1019  predicted
CL1019  predicted
CL1019  hypothetical
CL10246 unnamed
CL10246 predicted
CL10246 unnamed
CL10246 unnamed
CL10246 unnamed
CL10246 unnamed
CL10246 unnamed
CL1064  octicosapeptide/Phox/Bem1p
CL1064  octicosapeptide/Phox/Bem1p
CL1064  serine/threonine
CL1064  serine/threonine
CL1064  serine/threonine
CL1064  serine/threonine

这是原始数据。请复制并使用如下代码：

read.table("clipboard",strip.white=T,header=T)

然后，我该怎么办？排序后，我希望结果是这样的：

geneID  Nr.annotation
CL1002  PREDICTED:
CL1002  uncharacterized    4
CL1019  PREDICTED:         6
CL1019  hypothetical       1
CL1019  uncharacterized    1
CL10246 predicted          1
CL10246 unnamed            6
CL1064  octicosapeptide/Phox/Bem1p  2
CL1064  serine/threonine   4

Answer 1

您可以使用plyr和arrange。您所做的只是先按一列排序，然后再按下一列

library(plyr)

arrange(DF,geneID, Nr.annotation)

（在第二次查看时，您的示例输出不太有意义。您如何获得以下组合

CL1002 PREDICTED: