memisc (version 0.96-10)

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

## S3 method for class 'data.frame':
sample(x, size, replace = FALSE, prob = NULL)
## S3 method for class 'data.set':
sample(x, size, replace = FALSE, prob = NULL)
## S3 method for class 'importer':
sample(x, size, replace = FALSE, prob = NULL)

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.

Value

• A data frame or data set.

Examples

for(.i in 1:4)
  print(sample(iris,5))