What is wrong with my code.It's not producing correct figure.The axis should run from -1 to 1,but it's not!

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

[Nicole Peltier]

Square waves are periodic, so you need to incorporate sine. Below is the equation for a square wave with period T:

squarewave(t) = sign(sin((2*pi*t)/T);

To get your 2D output A, you need to multiply two 1D square waves together.

Give it another shot, and let us know if you need more help!