Spiral art using Circles in MATLAB

MATLAB Program:

%Code:
%https://www.matlabcoding.com/
figure;
pause(10);
fill([-40 -40 40 40],[-40 40 40 -40],'k');
hold on;
t=0:0.1:10*pi;
 x=t.*cos(t);
 y=t.*sin(t);
 r=0.02;
 m=0;
for i=1:length(x)
    if(rem(m,2)==0)
    a=x(i)+r*cos(t);
    b=y(i)+r*sin(t);
       fill(a,b,'w');
    else
        a=x(i)+r*cos(t);
    b=y(i)+r*sin(t);
       fill(a,b,'k');
    end
    m=m+1;
       hold on;
    axis ([-40 40 -40 40]);
    axis square;
    pause(0.1);
    r=r+0.02;
end




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