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+//Example 1.8a
+//Check whether the given signal is periodic or not
+clc;
+n=-20:20;
+x=cos(0.1*%pi*n);
+plot2d3(n,x);
+f=0.1*%pi/(2*%pi);//f is no. of cycles per sample
+N=1/f;//N is no. of samples per cycle
+disp('samples',N,'Figure shows that the signal is periodic with period equal to');
+\ No newline at end of file