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Matlab code for plot with limit values

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clear all
clc
fprintf('\n fixing a Graph\n')
theta = 0:.2:4*pi
y1 = cos(theta);
y2 = sin(theta);
y3 = atan(theta-(pi/2));

plot(theta,y1, 'b-*', theta,y2,'m.',theta,y3,'g--')
axis([0 4*pi -2 2]);
xlim([0 6.5])
ylim([-1.5 1.5])
title('Sample Function');
legend('cos','sin','atan');
xlabel('Angle');
ylabel('Value');




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