disk.frame (version 0.3.7)

sample_frac.disk.frame: Sample n rows from a disk.frame

Description

Sample n rows from a disk.frame

Usage

# S3 method for disk.frame
sample_frac(tbl, size = 1, replace = FALSE, weight = NULL, .env = NULL, ...)

Arguments

tbl

A data.frame.

size

<tidy-select> For sample_n(), the number of rows to select. For sample_frac(), the fraction of rows to select. If tbl is grouped, size applies to each group.

replace

Sample with or without replacement?

weight

<tidy-select> Sampling weights. This must evaluate to a vector of non-negative numbers the same length as the input. Weights are automatically standardised to sum to 1.

.env

DEPRECATED.

...

ignored

Examples

# NOT RUN {
cars.df = as.disk.frame(cars)

collect(sample_frac(cars.df, 0.5))

# clean up cars.df
delete(cars.df)
# }