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+//example 6.4.A
+//check the signal is periodic or not
+clc ;
+n=-15:0.01:15;
+y =sin((6*(%pi)*n/7)+1);
+xlabel('n')
+ylabel('x(n)')
+plot2d(n,y);
+disp ( 'Plot  shows that given signal is periodic of fundamental period=7 samples' ) ;