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  • R因子

    factor(x = character(), levels, labels = levels,

           exclude = NA, ordered = is.ordered(x), nmax = NA)

    levels因子水平,如果不指定,就是x中所有不重复的值

    labels水平标识名称

    exclude排除哪些水平

    ordered—TRUE表示有序因子,FALSE表示无序因子

    nmax水平个数上限

    > f<-c("Spark","RDD","Scala","MLlib","GraghX", "Spark","Scala","GraghX","Spark","Scala")

    > f1<-factor(f)

    > class(f1)

    [1] "factor"

    > str(f1)

     Factor w/ 5 levels "GraghX","MLlib",..: 5 3 4 2 1 5 4 1 5 4

    > length(f1)  数据长度,而不是个数

    [1] 10

     

    > f2<-factor(f,levels=c("Spark","RDD","Scala"))

    > f2

     [1] Spark RDD   Scala <NA>  <NA>  Spark

     [7] Scala <NA>  Spark Scala

    Levels: Spark RDD Scala

    > f3<-factor(f,levels=c("Spark","RDD","Scala","MLlib","GraghX","Hadoop","Hive"))

    > f3

     [1] Spark  RDD    Scala  MLlib  GraghX

     [6] Spark  Scala  GraghX Spark  Scala

    7 Levels: Spark RDD Scala ... Hive

     

    > fa<-c(1,2)

    > fa1<-factor(fa,labels = c("男","女"))

    > str(fa1)

     Factor w/ 2 levels "男","女": 1 2

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  • 原文地址:https://www.cnblogs.com/wwxbi/p/6087378.html
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