achecker.m

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function A=achecker(n)
% The command A=achecker(n) generates an nxn matrix A
% whose entries alternate between 1 and 0. Specifically
% C(i,j)=1 if i+j is odd, otherwise C(i,j)=0. This matrix
% is similar to the checker matrix except the matrix begins
% with a 0 as its (1,1) entry while the checker matrix 
% starts with a one. For example the command achecker(4) 
% will generate  the matrix
%
%                  0  1  0  1
%                  1  0  1  0  
%                  0  1  0  1
%                  1  0  1  0
C=ones(n,1)*[1:n];
A=rem(C+C',2);