ffbase: ffrandom – R documentation

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ffrandom

Generate ff vector with draws from distribution

Description

A convenience function to generate ff vectors with draws from random distributions using functions such as runif, rnorm and rlnorm.

Usage

ffrandom(n, rfun = runif, ..., vmode = NULL)

Arguments

`n`	number of observations
`rfun`	a function generating the draws from the random distribution. This function should expect the number of draws as its first argument. Valid examples are the routines `runif`, `rnorm`, and `rlnorm`.
`...`	additional arguments are passed on to `rfun`.
`vmode`	the vmode of the resulting vector. See `ff`. If none given the vmode is determined from a single draw from `rfun`.

Details

Before generating the vector a single draw is taken from the distribution. This might be important if one tries to reproduce draws directly from rfun.

Value

An ff vector with draws from the distribution.

Examples

n <- ffrandom(1E3, rnorm, mean = 10, sd = 5)

set.seed(123)
runif(1)
a <- runif(10)
set.seed(123)
b <- ffrandom(10, runif)
identical(a, b[])

ffbase

Basic Statistical Functions for Package 'ff'

v0.13.3

GPL-3

Authors

Edwin de Jonge, Jan Wijffels, Jan van der Laan

Initial release