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+//Example 7.4
+
+clc;clear;close;
+M=7;w=2*%pi/M;
+
+//Calculation of filter co-efficients
+k=[0 1 6];
+for n=0:M-1
+    h(n+1)=sum(exp(-%i*3*w*k).*exp(%i*w*k*n))/M;
+end
+h=clean(h);
+
+//Displaying filter co-efficients
+disp(M,'Filter Order M= ');
+disp('Filter co-efficients:');
+disp(h,'h(n)= ');
+
+plot2d3(h);
+title('Filter transfer function h(n)');xlabel('n-->');
+\ No newline at end of file