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+//Graphical//

+//Example 5.3.1 

+//Performing Linear Filtering (i.e) Linear Convolution

+//Using DFT

+clear;

+clc;

+close;

+h = [1,2,3];    //Impulse Response of LTI System

+x = [1,2,2,1];  //Input Response of LTI System

+N1 = length(x)

+N2 = length(h)

+disp('Length of Output Response y(n)')

+N = N1+N2-1

+//Padding zeros to Make Length of 'h' and 'x'

+//Equal to length of output response 'y'

+h1 = [h,zeros(1,8-N2)]

+x1 = [x,zeros(1,8-N1)]

+//Computing DFT 

+H = dft(h1,-1)

+X = dft(x1,-1)

+//Multiplication of 2 DFTs

+Y = X.*H

+//Linear Convolution Result

+y =abs(dft(Y,1))

+for i =1:8

+  if(abs(H(i))<0.0001)

+    H(i) =0;

+  end

+  if(abs(X(i))<0.0001)

+    X(i) =0;

+  end

+  if(abs(y(i))<0.0001)

+    y(i) =0;

+  end

+end

+disp(X,'X=')

+disp(H,'H=')

+disp(y,'Output response using Convolution function')

+y = convol(x,h)