如何使用plyr为行编号? [英] How do I use plyr to number rows?

问题描述

基本上我想根据我的同类群组自动增加id列-在这种情况下.(kmer，cvCut)

Basically I want an autoincremented id column based on my cohorts - in this case .(kmer, cvCut)

    > myDataFrame
       size kmer cvCut   cumsum
1      8132   23    10     8132
10000   778   23    10 13789274
30000   324   23    10 23658740
50000   182   23    10 28534840
100000   65   23    10 33943283
200000   25   23    10 37954383
250000  584   23    12 16546507
300000  110   23    12 29435303
400000   28   23    12 34697860
600000  127   23     2 47124443
600001  127   23     2 47124570

我要添加一列，该列具有基于kmer/cvCut组的新行名

I want a column added that has new row names based on the kmer/cvCut group

    > myDataFrame
       size kmer cvCut   cumsum  newID
1      8132   23    10     8132      1
10000   778   23    10 13789274      2
30000   324   23    10 23658740      3
50000   182   23    10 28534840      4
100000   65   23    10 33943283      5 
200000   25   23    10 37954383      6
250000  584   23    12 16546507      1
300000  110   23    12 29435303      2
400000   28   23    12 34697860      3
600000  127   23     2 47124443      1
600001  127   23     2 47124570      2

推荐答案

我会这样做:

library(plyr)
ddply(df, c("kmer", "cvCut"), transform, newID = seq_along(kmer))

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