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x_opt = [ -0.767297326653401;
0.590671081117440;
1.47190018629642;
-1.52719341133957 ];
tol = 1.0e-5;
function retval = f (p)
x = p(1);
y = p(2);
z = p(3);
w = p(4);
retval = zeros (4, 1);
retval(1) = 3*x + 4*y + exp (z + w) - 1.007;
retval(2) = 6*x - 4*y + exp (3*z + w) - 11;
retval(3) = x^4 - 4*y^2 + 6*z - 8*w - 20;
retval(4) = x^2 + 2*y^3 + z - w - 4;
end
[x, info] = fsolve ("f", [-1, 1, 2, -1]);
val = f (x);
info_bad = (info != 1);
solution_bad = sum (abs (x - x_opt) > tol);
value_bad = sum (abs (val) > tol);
if (info_bad)
printf ("info bad\n");
else
printf ("info good\n");
endif
if (solution_bad)
printf ("solution bad\n");
else
printf ("solution good\n");
endif
if (value_bad)
printf ("value bad\n");
else
printf ("value good\n");
endif
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