[R] data frame에서 행 랜덤표본추출 방법

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

[R] Randomly extract rows from a data frame

Using the 'iris' dataset in R:

# Select 2 random rows

> 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