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+function [J] = jacob28(x)
+
+//Evaluates the Jacobian of a 2x2
+//system of non-linear equations
+
+J(1,1) = 2*x(1)+x(2); J(1,2) = x(1)+2*x(2);
+J(2,1) = 3*x(1)^2; J(2,2) =3* x(2)^2;
+endfunction
+