This is a very simple function that creates a 2D logical matrix with a checkerboard pattern. It's similar to the true or false functions.

% Syntax

tf = checker(N)
tf = checker([M N])
tf = checker(M,N)

% Description

tf = checker(N) creates an NxN checkerboard pattern.

tf = checker([M N]) creates an MxN checkerboard pattern.

tf = checker(M,N) creates an MxN checkerboard pattern.

% Example

imagesc(checker(5))