Create matrix with circular weight pattern

Source: R/w_circle.R

Creates a matrix with where a circular pattern is filled with values of 1 and the remaining cells are filled with values of 0 (see Examples).

w_circle(k)

Arguments

k

Neighborhood size around focal cell. Must be an odd number. For example, k=3 implies a 3*3 neighborhood.

Value

A matrix with a circular pattern.

Examples

m = w_circle(3)
image(m, asp = 1, axes = FALSE)

m = w_circle(5)
image(m, asp = 1, axes = FALSE)

m = w_circle(15)
image(m, asp = 1, axes = FALSE)

m = w_circle(35)
image(m, asp = 1, axes = FALSE)

m = w_circle(91)
image(m, asp = 1, axes = FALSE)

m = w_circle(151)
image(m, asp = 1, axes = FALSE)