initial commit / add all books

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diff --git a/67/CH7/EX7.56/example756.sce b/67/CH7/EX7.56/example756.sce
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+//Example 7.56

+//Determine the input x[n] if h[n]=[1,2,3]and y[n]=[1,1,2,-1,3]

+clc;

+clear;

+function[za]=ztransfer(sequence,n)

+    z=poly(0,'z','r')

+    za=sequence*(1/z)^n'

+endfunction

+z=poly(0,'z');

+h=[1,2,3];

+n1=0:length(h)-1;

+H=ztransfer(h,n1);

+y=[1,1,2,-1,3];

+n2=0:length(y)-1;

+Y=ztransfer(y,n2);

+X=Y/H;

+funcprot(0);

+funcprot(0);

+x=ldiv(1-z+z^2,z^2,3);

+disp(x,'x[n]=');
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