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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')