initial commit / add all books

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diff --git a/3446/CH24/EX24.1/Ex_D1.sce b/3446/CH24/EX24.1/Ex_D1.sce
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+// Exa D.1

+// Using the shift register shown in Figure D.3, generate an m-sequence and demonstrate its properties. 

+

+clc;

+clear all;

+

+//solution

+//Referring Fig D.3

+x=[0 0 1]; //Initial stage

+output=x(3);

+disp(" First m-sequence using 3-stage shift register.");

+disp("           x1 x2 x3         output");

+printf(' Initial    %d  %d  %d           %d \n ',x(1),x(2),x(3),output);

+for i= 1:7

+    printf('Shift %d',i);

+    x(3)=x(2);

+    if(x(3)==1) //TO get values in range of [-1 1] for plot

+    dummy(i)=-1

+else

+    dummy(i)=1;

+    end

+    x(2)=x(1);

+   if(output== 1& x(3)==1) //As new x(1)=prev stage x(3) ored                                   prev stage x(2)

+       x(1)=0;

+   else

+       if(output== 0& x(3)==0)

+           x(1)=0;

+       else

+           x(1)=1;

+       end

+   end

+   

+    printf('    %d  %d  %d ',x(1),x(2),x(3));

+     output=x(3);

+     printf('          %d',output);

+      printf('\n ');

+end

+bar(dummy,0.2,'green');

+xlabel("Time","FontSize",5);

+title("7-chip first m-sequence for one T period","FontSize",5);

+disp("The properties of m-sequence in Figure(0)are -");

+disp("Number of -1s = 4 , Number of 1s = 3 ");

+disp("Run length 1 = 2 , Run length 2 = 1");

+disp("Run length  = 1");

+