initial commit / add all books

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diff --git a/851/CH6/EX06.1/Figure06_1.sce b/851/CH6/EX06.1/Figure06_1.sce
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+//clear//

+//Caption:Nonreturn-to-zero polar format

+//Figure 6.1(b): Discrete PAM Signals Generation

+// [2].Polar NRZ

+//page 235

+clear;

+close;

+clc;

+x = [0 1 0 0 0 1 0 0 1 1];

+binary_negative = [-1 -1 -1 -1 -1 -1 -1 -1 -1 -1];

+binary_positive = [1 1 1 1 1 1 1 1 1 1];

+L = length(x);

+L1 = length(binary_negative);

+total_duration = L*L1;

+//plotting

+a =gca();

+a.data_bounds =[0 -2;L*L1 2];

+for i =1:L

+  if(x(i)==0)

+    plot([i*L-L+1:i*L],binary_negative);

+    poly1= a.children(1).children(1);

+    poly1.thickness =3;

+  else

+    plot([i*L-L+1:i*L],binary_positive);

+    poly1= a.children(1).children(1);

+    poly1.thickness =3;

+  end

+end

+xgrid(1)

+title('Polar NRZ')