initial commit / add all books

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diff --git a/29/CH2/EX2.4.1/exa2_4_1.sce b/29/CH2/EX2.4.1/exa2_4_1.sce
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+//Caption:pole_zero_Plot

+// example 2.4.1

+//page 19

+//transfer function:G(s)=(1/2((s^2+4)*(1+2.5*s))/((s^2+2)*(1+0.5*s)))

+s=%s;

+G=syslin('c',(1/2*((s^2+4)*(1+2.5*s))/((s^2+2)*(1+0.5*s))));

+disp(G,"G(s)=");

+x=plzr(G)

+xtitle('pole-zero_configuration','Real_part','Img_part');

+// value at s=2

+a=2;

+g=(1/2*((a^2+4)*(1+2.5*a))/((a^2+2)*(1+0.5*a)));

+disp(g,"G(2)=");