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+//Example 1.13<i>

+//Check whether the given signal is periodic or not

+clc;

+t=-10:.01:10;

+y=2*cos(10*t+1)-sin(4*t-1);

+subplot(221)

+plot(t,y);

+disp('(a) The following signal is periodic with period %pi' );

+//Example 1.13<ii>

+//Show whether the given signal is periodic or not

+clc;

+t=-1:.01:1;

+x=cos(60*%pi*t)+sin(50*%pi*t);

+subplot(222)

+plot(t,x);

+disp('(b)Ther following figure shows that the given signal is periodic with the following period');

+//Example1.13<iv>

+//Check whether the given signal is periodic or not

+clc;

+t=-10:0.01:10;

+x=3*cos(4*t)+2*sin(%pi*t);

+subplot(223)

+plot(t,x);

+disp('(c)The signal is not periodic since ratio of two time periods is %pi/4 which is not rational number');

+//Example 1.13<V>

+//Check whether the given signal is periodic or not

+clc;

+t=0:10;

+for i=1:length(t)

+    u(i)=1;

+end

+x=u(i)-(1/2);

+subplot(224)

+plot(t,x);

+disp('(d)The signal is not periodic as seen from figure');

+

+disp('In the figure we have the plots of part (a) - (d) in clockwise order strating from the top left')

+