generate.grid.centers: Compute center coordinates of cells in a regular grid

In mathiasisaksen/GRFics: Efficient generation of noise functions from approximate Gaussian random fields

Description

Given a rectangular extent and a resolution in both the x- and y-directions, this function computes the coordinates of the centers of the grid cells.

Usage

generate.grid.centers(x.lower, x.upper, y.lower, y.upper, resolution.x,
  resolution.y, params, separate = FALSE)

Arguments

x.lower, x.upper, y.lower, y.upper	Specifies the boundaries of the rectangular region that the GRF is defined on.
resolution.x, resolution.y	The number of grid cells used for the regular grid, in the x- and y-direction, respectively.
params	The parameters above can instead be specified in the list params.
separate	If true, the function returns the x- and y-coordinates of the centers in separate vectors.

Value

A (resolution.x*resolution.y) x 2 matrix specifying the centers of the grid cells. If separate = FALSE, a list of two vectors of length resolution.x and resolution.y.

Author(s)

Mathias Isaksen [e-mail]

Examples

library(GRFics)
# Create a 15 x 15 regular grid on [-1, 1]^2
reg.grid = generate.grid.centers(-1, 1, -1, 1, 15, 15)
plot(reg.grid, asp = 1, pch = 16)
abline(h = seq(-1, 1, length.out = 16),
       v = seq(-1, 1, length.out = 16))

mathiasisaksen/GRFics documentation built on May 20, 2021, 5:55 a.m.