initial commit / add all books

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diff --git a/62/CH2/EX2.6/ex_2_6.sce b/62/CH2/EX2.6/ex_2_6.sce
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+//Example 2.6:Convolution Integral 

+clear;

+close;

+clc;

+t =-5:1/100:5;

+for i=1:length(t)

+    if t(i)<0 then

+        h(i)=0;

+        x(i)=0;

+    elseif t(i)<=2

+        h(i)=1;

+        x(i)=1;

+    elseif t(i)<=3

+        h(i)=0;

+        x(i)=1;

+    else

+        h(i)=0;

+        x(i)=0; 

+    end

+end

+y = convol(x,h)./100;

+figure

+a=gca();

+a.x_location="origin";

+plot2d(t,h) 

+xtitle('Impulse Response','t','h(t)');

+a.children.children.thickness = 3;

+a.children.children.foreground= 2;

+figure

+a=gca();

+plot2d(t,x) 

+xtitle('Input Response','t','x(t)');

+a.children.children.thickness = 3;

+a.children.children.foreground= 2;

+figure

+a=gca();

+t1=-10:1/100:10;

+a.y_location="origin";

+a.x_location="origin";

+plot2d(t1,y) 

+xtitle('Output Response','t','y(t)');

+a.children.children.thickness = 3;

+a.children.children.foreground= 2;
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