physx (version 1.0)

runif3: Generate randomly oriented vectors in 3D

Description

Generate randomly oriented vectors in 3D, following an isotropic distribution (optionally truncated to a region).

Usage

runif3(n = 1, r = c(0, 1), azimuth = c(0, 2 * pi), polarangle = c(0, pi))

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 (maximum range 0..2*pi)

polarangle

2-vector specifying the range of polar angles (maximum range 0..pi)

Value

Returns an n-by-3 array of n vectors.

See Also

runif2

Examples

# NOT RUN {
## draw 20 unit vectors on a sphere
x = runif3(20,r=c(1,1))
print(rowSums(x^2))

# }