Rainbow in MatLab

MATLAB program:

%Code:

figure;

pause(5);

t=0:0.001:pi;

x=8*cos(t);

y=8*sin(t);

fill(x,y,'r');

hold on;

x=7*cos(t);

y=7*sin(t);

patch(x,y,[1 0.5 0]);

hold on;

x=6*cos(t);

y=6*sin(t);

fill(x,y,'y');

hold on;

x=5*cos(t);

y=5*sin(t);

fill(x,y,'g');

hold on;

x=4*cos(t);

y=4*sin(t);

patch(x,y,[  0.5843    0.8157    0.9882]);

hold on;

x=3*cos(t);

y=3*sin(t);

fill(x,y,'b');

hold on;

x=2*cos(t);

y=2*sin(t);

patch(x,y,[0.4039    0.0078    0.3686]);

t=0:0.01:pi;

x=cos(t);

y=sin(t);

fill(x,y,'w');

plot([-1 1],[0 0],'w');

axis equal;