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+//Example 3.21
+//Program to Compute Linear Convolution of following sequences
+//x[n]=[1,2,-1,2,3,-2,-3,-1,1,1,2,-1]
+//h[n]=[1,2]
+clear;
+clc ;
+close ;
+x=[1,2,-1,2,3,-2,-3,-1,1,1,2,-1];
+h=[1,2];
+// Linear Convolution Computation
+y=convol (x,h);
+//Display Sequence y[n] in command window
+disp(y,"y[n]=");
+\ No newline at end of file