initial commit / add all books

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diff --git a/67/CH1/EX1.19.a/example119a.sce b/67/CH1/EX1.19.a/example119a.sce
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+//Example 1.19a

+clc;

+x1=[1,1,1,1]

+x2=[2,2,2,2]

+a=1

+b=1

+for t=1:length(x1)

+    x3(t)=a*x1(t)+b*x2(t)

+end

+for t=1:length(x1)

+    y1(t)=t*x1(t)

+    y2(t)=t*x2(t)

+    y3(t)=t*x3(t)

+end

+for t=1:length(y1)

+    z(t)=a*y1(t)+b*y2(t)

+end

+count=0

+for n=1:length(y1)

+    if(y3(t)==z(t))

+        count=count+1;

+     end   

+end

+if(count==length(y3))

+    disp('It satisfy the superposition principle');

+    disp('THE GIVEN SYSTEM IS LINEAR ');

+else

+    disp('It does not satisfy superposition principle ');

+    disp('THE GIVEN SYSTEM IS NON LINEAR');

+end
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