Problem 24. Write a function called make_square_waves that takes two
positive integers as input arguments (it does not have to check the format of
the input) and returns a two-dimensional array. If it is called like this
A = make_square_waves(M,N), then A is an N-by-N array of products of
square waves whose amplitude is 1 and whose period is N/M . The result can
be achieved by modifying the function make_waves, which is described in
the previous problem. The modification involves the use of the built-in function
sign. Here is an example:
>> surf(make_square_waves(2,50));axis square
which produces Figure .
function A=make_square_waves(M,N)
A=zeros(N,N);
for ii=1:N
for jj=1:N
A(ii,jj)=sign(M*2*pi*ii/N)*sign(M*2*pi*jj/N);
end
end
end
