sample: Sample n rows from a disk.frame

In disk.frame: Larger-than-RAM Disk-Based Data Manipulation Framework

Sample n rows from a disk.frame

Description

Sample n rows from a disk.frame

Usage

## S3 method for class '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

cars.df = as.disk.frame(cars)

collect(sample_frac(cars.df, 0.5))

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

disk.frame documentation built on Aug. 24, 2023, 5:09 p.m.