initial commit / add all books

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+//EXAMPLE 3.12
+//x[n]=((-1)^n)*(a^n)*u[n].....given a=0.5;
+
+clc;
+clear;
+
+a=0.5;
+n=0:9;
+for i = 0:9
+    x(i+1) = (a*exp(-%i*%pi))^i;
+end
+
+//The DTFT of the sequence
+K = 4;
+k = 0:4/1000:4;
+W = k*6*%pi/K;
+X = (x')*exp(%i*n'*W);
+X_mag   = abs(X);
+X_phase = phasemag(X);
+
+//PLOTTING GRAPHS FOR THE INTERVAL OF 0 TO 6*%pi
+clf();
+a=gca();
+figure(0);
+plot2d3(mtlb_fliplr(W),X_mag);
+xtitle('Magnitude response','W','Amplitude');
+figure(1);
+plot2d3(mtlb_fliplr(W),X_phase);
+xtitle('Phase response','W','X_phase,degrees');
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