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+//Graphical//
+//Example 4.4.4 
+//Frequency Response of First Order Difference Equation
+//a = 0.9 and b = 1-a 
+//Impulse Response h(n) = b.(a^n).u(n)
+clear;
+clc;
+close;
+a = input('Enter the constant value of Ist order Difference Equation');
+b= 1-a;
+//Calculation of Impulse Response
+n =0:50;
+h =b*(a.^n) ;
+//Discrete-time Fourier transform
+K = 500; 
+k = 0:1:K;
+w = %pi*k/K;
+H = h * exp(-sqrt(-1)*n'*w);
+//phasemag used to calculate phase and magnitude in dB
+[Phase_H,m] = phasemag(H);
+H = real(H);
+subplot(2,1,1)
+plot2d(w/%pi,H)
+xlabel('Frequency in Radians')
+ylabel('abs(H)')
+title('Magnitude Response')
+subplot(2,1,2)
+plot2d(w/%pi,Phase_H)
+xlabel('Frequency in Radians')
+ylabel('<(H)')
+title('Phase Response')