[R 프로그래밍] 데이터 프레임에서 두개의 랜덤값 뽑아내기

출처: https://stat.ethz.ch/pipermail/r-help/2007-February/125860.html

> iris[sample(nrow(iris), 2), ]
   Sepal.Length Sepal.Width Petal.Length Petal.Width    Species
96          5.7         3.0          4.2         1.2 versicolor
17          5.4         3.9          1.3         0.4     setosa



# Select 5 random rows

> iris[sample(nrow(iris), 5), ]
   Sepal.Length Sepal.Width Petal.Length Petal.Width    Species
83          5.8         2.7          3.9         1.2 versicolor
12          4.8         3.4          1.6         0.2     setosa
63          6.0         2.2          4.0         1.0 versicolor
80          5.7         2.6          3.5         1.0 versicolor
49          5.3         3.7          1.5         0.2     setosa