Take a Sample from a Data Frame-like Object
sample-methods.RdThe methods below are convenience short-cuts to take samples from data frames and data sets. They result in a data frame or data set, respectively, the rows of which are a sample of the complete data frame/data set.
Arguments
- x
a data frame or data set.
- size
an (optional) numerical value, the sample size, defaults to the total number of rows of
x.- replace
a logical value, determines whether sampling takes place with or without replacement.
- prob
a vector of sampling probabities or NULL.
Examples
for(.i in 1:4)
print(sample(iris,5))
#> Sepal.Length Sepal.Width Petal.Length Petal.Width Species
#> 74 6.1 2.8 4.7 1.2 versicolor
#> 136 7.7 3.0 6.1 2.3 virginica
#> 129 6.4 2.8 5.6 2.1 virginica
#> 38 4.9 3.6 1.4 0.1 setosa
#> 81 5.5 2.4 3.8 1.1 versicolor
#> Sepal.Length Sepal.Width Petal.Length Petal.Width Species
#> 10 4.9 3.1 1.5 0.1 setosa
#> 55 6.5 2.8 4.6 1.5 versicolor
#> 98 6.2 2.9 4.3 1.3 versicolor
#> 40 5.1 3.4 1.5 0.2 setosa
#> 15 5.8 4.0 1.2 0.2 setosa
#> Sepal.Length Sepal.Width Petal.Length Petal.Width Species
#> 60 5.2 2.7 3.9 1.4 versicolor
#> 12 4.8 3.4 1.6 0.2 setosa
#> 50 5.0 3.3 1.4 0.2 setosa
#> 103 7.1 3.0 5.9 2.1 virginica
#> 2 4.9 3.0 1.4 0.2 setosa
#> Sepal.Length Sepal.Width Petal.Length Petal.Width Species
#> 148 6.5 3.0 5.2 2.0 virginica
#> 68 5.8 2.7 4.1 1.0 versicolor
#> 145 6.7 3.3 5.7 2.5 virginica
#> 95 5.6 2.7 4.2 1.3 versicolor
#> 18 5.1 3.5 1.4 0.3 setosa