cooltools (version 2.4)

runif2: Generate randomly oriented vectors in 2D

Description

Generate randomly oriented vectors in 2D, following an isotropic distribution (optionally truncated to a region).

Usage

runif2(n = 1, r = c(0, 1), azimuth = c(0, 2 * pi), quasi = FALSE, start = 1)

Value

Returns an n-by-2 array of n vectors.

Arguments

n

number of random vectors to be generated

r

2-vector specifying the range of radii

azimuth

2-vector specifying the range of azimuth angles

quasi

logical flag. If true, quasi-random numbers with low-discrepancy are drawn, based on a Halton sequence. Otherwise, the standard internal pseudo-random generator of runif() is used.

start

starting index of Halton sequence. Only used if quasi=TRUE.

Author

Danail Obreschkow

See Also

runif3

Examples

## generate 500 unit vectors with radii between 0.5 and 1
x = runif2(500,r=c(0.5,1))
oldpar = par(pty='s')
plot(x,pch=20)
par(oldpar)