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+//example 3.13
+//Represent the sequence as sum of shifted unit impulse.
+clear ;
+ close ;
+ clc ;
+ t= -1:1:4;T=3;
+ x=[3 2 -1 2 4 1];
+ for i =1: length (t)
+ if modulo(t(i),3)==0 then
+ h(i)=1;
+else
+ h(i)=0;
+ end
+ end
+ y = convol(x,h);
+ //figure
+ f=scf(0);
+ plot2d (t,h)
+ xtitle ( ' Input Re spons e ' , ' t ' , ' h ( t ) ' );
+  xs2jpg(0, 'problem38-plot-a.jpg');
+// figure
+f=scf(1);
+ plot2d (t,x)
+ xtitle ( ' Input Re spons e ' , ' t' , ' x ( t ) ' );
+  xs2jpg(1, 'problem38-plot-b.jpg');
+ //figure
+ f=scf(2);
+ a= gca ();
+ t1 =-2:1:8;
+ plot2d (t1 ,y)
+ xtitle ( ' Output Re spons e ' , ' t ' , ' y ( t) ' );
+  xs2jpg(2, 'problem38-plot-c.jpg');