memisc (version 0.99.31.7)

sample-methods: Take a Sample from a Data Frame-like Object

Description

The 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.

Usage

# S4 method for data.frame
sample(x, size, replace = FALSE, prob = NULL)
# S4 method for data.set
sample(x, size, replace = FALSE, prob = NULL)
# S4 method for importer
sample(x, size, replace = FALSE, prob = NULL)

Value

A data frame or 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))