Xcos examples from textbooks and for blocksHEADmaster

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diff --git a/Working_Examples/154/CH7/EX7.22/ch7_22.sce b/Working_Examples/154/CH7/EX7.22/ch7_22.sce
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+clc

+disp("Example 7.22")

+printf("\n")

+

+//The general equation of exponential decay function is given by

+disp("v(t)=A*e(-t/T)+B")

+//We need to solve A and B

+//At t=0 we get v(0)=A+B    (1)

+//at t=inf we get B=1       (2)

+//Solving (1) and (2)

+A=4;B=1;

+T=3;

+t=0:0.05:10

+v=4*exp(-t/T)+1;

+figure

+a= gca ();

+plot(t,v)

+xtitle ('v vs t','t','v');

+a. thickness = 2;

+

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