initial commit / add all books

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+//EXAMPLE 2.6, Energy Signal 
+
+clear ;
+clc ;
+n = -5:5;
+for i =1:length ( n )
+ if(n(i)>=1)
+ h(i)=1/n(i);
+ else
+ h(i)=0;
+ end
+end
+
+Sum=0;
+N=1:10000;
+  for i=1:length(N)
+  h(i)=(1/N(i))^2;
+  end 
+
+Energy = sum(h);
+
+ if (Energy<%inf ) then
+  disp ('Energy Signal') ;
+  disp(Energy,'Energy of signal = ');
+  else
+  if  (Energy/length(N)<%inf ) then
+  disp ('Power Signal') ;
+     
+  else
+  disp ('Niether Energy nor Power Signal') ;   
+  end
+ end