fy=b(1)+b(2)*x.^3+b(3)*exp(b(4)*x+b(5)*x.^2+b(6)*x.^3);
y1
b=[ .166999866, -.122369752e-1, .339402702e151, -1364.59471, 1495.21821, -500.935404]
RSS =.1388522567e-3
R^2 = .999074
y2
b =[.170609344, -.148628605e-1, .469726606e151, -1384.65414, 1525.99841, -512.880376]
RSS =.3427292373e-3
R^2 =.997837
但，数据点太少，这些可能并不能说明问题。
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