White noise generator — noise

White noise is a random noise with equal intensities at different frequencies. It is most well-known as what appeared on old televisions when no signal was found.

noise_white(
  dim,
  frequency = 0.01,
  pertubation = "none",
  pertubation_amplitude = 1
)

gen_white(x, y = NULL, z = NULL, t = NULL, frequency = 1, seed = NULL, ...)

Arguments

dim: The dimensions (height, width, (and depth, (and time))) of the noise to be generated. The length determines the dimensionality of the noise.
frequency: Determines the granularity of the features in the noise.
pertubation: The pertubation to use. Either 'none' (default), 'normal', or 'fractal'. Defines the displacement (warping) of the noise, with 'normal' giving a smooth warping and 'fractal' giving a more eratic warping.
pertubation_amplitude: The maximal pertubation distance from the origin. Ignored if pertubation = 'none'. Defaults to 1.
x, y, z, t: Coordinates to get noise value from
seed: The seed to use for the noise. If NULL a random seed will be used
...: ignored

Value

For noise_white() a matrix if length(dim) == 2 or an array if length(dim) >= 3. For gen_white() a numeric vector matching the length of the input.

Examples

# Basic use
noise <- noise_white(c(100, 100))

plot(as.raster(normalise(noise)))


# Using the generator
grid <- long_grid(seq(1, 10, length.out = 1000), seq(1, 10, length.out = 1000))
grid$noise <- gen_white(grid$x, grid$y)
plot(grid, noise)