"R table()"의 두 판 사이의 차이

2020년 5월 5일 (화) 22:32 판

1 개요

R table()

벡터

x <- c(3,1,4,1,5,2,6,5)
table(x)

table( c(3,1,4,1,5,2,6,5) )

데이터프레임$컬럼

table(iris$Species)

v <- c(1, 'hello', 1, 'world', 'hello')
table(v)

summary(warpbreaks)
options(echo=T)
table(warpbreaks$wool,warpbreaks$tension)

scores <- read.table( header=TRUE, stringsAsFactors=FALSE, text="
Class  Name variable value
    A Alice  English    90
    A   Bob  English    80
    B  Dave  English    60
    A Alice     Math    60
    B Carol     Math    80
    B  Dave     Math    90
")
options(echo=T)
table( scores$variable )
table( scores$value )

table()과 ddply()

library(plyr)
options(echo=T)
table(baseball[1:100,]$year)
ddply(baseball[1:100,], ~year, nrow)
ddply(baseball[1:100,], 'year', nrow)
ddply(baseball[1:100,], .(year), nrow)

2 같이 보기

3 참고

https://www.rdocumentation.org/packages/base/versions/3.5.3/topics/table

@@ 2번째 줄: / 2번째 줄: @@
 ;R table()
 {{소스헤더|벡터}}
-<source lang='r'>
+<source lang='r' run>
 x <- c(3,1,4,1,5,2,6,5)
 table(x)
-## x
-## 1 2 3 4 5 6
-## 2 1 1 1 2 1
 </source>
-<source lang='r'>
+<source lang='r' run>
 table( c(3,1,4,1,5,2,6,5) )
-##
-## 1 2 3 4 5 6
-## 2 1 1 1 2 1
 </source>
 {{소스헤더|데이터프레임$컬럼}}
-<source lang='r'>
+<source lang='r' run>
 table(iris$Species)
-##    setosa versicolor  virginica
-##        50         50         50
 </source>
-<source lang='r'>
+<source lang='r' run>
 v <- c(1, 'hello', 1, 'world', 'hello')
 table(v)
-## v
-##     1 hello world
-##     2     2     1
 </source>
-<source lang='r'>
+<source lang='r' run>
 summary(warpbreaks)
-##     breaks      wool   tension
+options(echo=T)
-## Min.   :10.00   A:27   L:18
-## 1st Qu.:18.25   B:27   M:18
-## Median :26.00          H:18
-## Mean   :28.15
-## 3rd Qu.:34.00
-## Max.   :70.00
 table(warpbreaks$wool,warpbreaks$tension)
-##
-##   L M H
-## A 9 9 9
-## B 9 9 9
 </source>
-<source lang='r'>
+<source lang='r' run>
 scores <- read.table( header=TRUE, stringsAsFactors=FALSE, text="
 Class  Name variable value
@@ 54번째 줄: / 33번째 줄: @@
      B  Dave     Math    90
 ")
-scores
+options(echo=T)
-##   Class  Name variable value
-## 1     A Alice  English    90
-## 2     A   Bob  English    80
-## 3     B  Dave  English    60
-## 4     A Alice     Math    60
-## 5     B Carol     Math    80
-## 6     B  Dave     Math    90
 table( scores$variable )
-## English    Math
-##       3       3
 table( scores$value )
-## 60 80 90
-##  2  2  2
 </source>
 {{소스헤더|table()과 ddply()}}
 <source lang='r'>
 library(plyr)
+options(echo=T)
 table(baseball[1:100,]$year)
-##
-## 1871 1872 1873 1874 1875 1876 1877 1878
-##    7   13   13   15   17   15   17    3
 ddply(baseball[1:100,], ~year, nrow)
 ddply(baseball[1:100,], 'year', nrow)
 ddply(baseball[1:100,], .(year), nrow)
-##   year V1
-## 1 1871  7
-## 2 1872 13
-## 3 1873 13
-## 4 1874 15
-## 5 1875 17
-## 6 1876 15
-## 7 1877 17
-## 8 1878  3
 </source>