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+//example no. 3.14
+//solve system by cholesky method
+
+A=[1 2 3;2 8 22;3 22 82]
+
+b=[5;6;-10]
+
+L=cholesky (A,3) //call cholesky function to evaluate the root of the system
+n=3;
+Z=fore(L,b);
+
+X=back(L',Z) \ No newline at end of file