w_circle: Create matrix with circular weight pattern

In starsExtra: Miscellaneous Functions for Working with 'stars' Rasters

Description

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).

Usage

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)

starsExtra documentation built on Nov. 18, 2021, 5:08 p.m.