initial commit / add all books

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diff --git a/692/CH5/EX5.4/P5_4.sce b/692/CH5/EX5.4/P5_4.sce
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+//EXAMPLE 5.4
+//DETERMINE IDFT OF GIVEN SEQUENCE
+clc;
+clear;
+K = input("   value of K   ");
+disp('input M > K');
+M = input("   value of M   ");
+k1 = 0:K-1;
+V1 = k1./K;//DFT
+k=0:M-1;
+
+N = length(V1);
+V = [V1,zeros(1,M-N)];
+v = dft(V,1);//IDFT
+
+clf();
+subplot(1,2,1)
+
+a = gca();
+plot2d3(k,real(v),2);
+plot(k,real(v),'r.');
+a.x_location = 'origin';
+a.y_location = 'origin';
+poly1 = a . children (1) . children (1) ;
+poly1.thickness = 2;
+xtitle('real part','N','v');
+
+subplot(1,2,2)
+a = gca();
+plot2d3(k,imag(v),2)
+plot(k,imag(v),'r.');
+a.x_location = 'origin';
+a.y_location = 'origin';
+poly1 = a . children (1) . children (1) ;
+poly1.thickness = 2;
+xtitle('imaginary part','N','v');
+v = disp(v);