initial commit / add all books

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diff --git a/70/CH3/EX3.4.4/3_4_4.sci b/70/CH3/EX3.4.4/3_4_4.sci
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+//page 166
+clear;
+close;
+clc;
+disp('y=C+Dt');
+disp('Ax=b');
+A=[1 -3;1 0;1 3];
+disp(A,'A=');
+y=rand    (3,1);
+disp(y,'y=');
+disp('the columns of A are orthogonal,so')
+x=zeros(1,2);
+disp(([1 1 1]*y)/(A(:,1)'*A(:,1)),'C^ =');
+disp(([-3 0 3]*y)/(A(:,2)'*A(:,2)),'D^ =')
+disp('C^ gives the besy fit ny horizontal line, whereas D^t is the best fit by a straight line through the origin.')
+//end
\ No newline at end of file