x=[100 0.6 60 120;

120 0.6 60 120;

130 0.6 60 120;

140 0.6 60 120;

150 0.6 60 120;

160 0.6 60 120;

170 0.6 60 120;

180 0.6 60 120;

190 0.6 60 120;

200 0.6 60 120;

210 0.6 60 120;

220 0.6 60 120;

230 0.6 60 120;

240 0.6 60 120;

250 0.6 60 120;

200 0.4 60 120;

200 0.45 60 120;

200 0.5 60 120;

200 0.55 60 120;

200 0.6 60 120;

200 0.65 60 120;

200 0.7 60 120;

200 0.75 60 120;

200 0.8 60 120;

200 0.58 60 120;

200 0.68 60 120;

200 0.78 60 120;

200 0.72 60 120;

200 0.62 60 120;

100 0.6 40 150;

100 0.6 44 150;

100 0.6 46 150;

100 0.6 48 150;

100 0.6 50 150;

100 0.6 52 150;

100 0.6 56 150;

100 0.6 60 150;

100 0.6 62 150;

100 0.6 64 150;

100 0.6 68 150;

100 0.6 70 150;

100 0.6 76 150;

100 0.6 80 150;

100 0.6 60 110;

100 0.6 60 114;

100 0.6 60 118;

100 0.6 60 122;

100 0.6 60 126;

100 0.6 60 130;

100 0.6 60 134;

100 0.6 60 138;

100 0.6 60 140;

100 0.6 60 142;

100 0.6 60 146;

100 0.6 60 150;

100 0.6 60 154;

100 0.6 60 160];

F=[0.9059;

0.8851;

0.8806;

0.8797;

0.8769;

0.8745;

0.8801;

0.8805;

0.8806;

0.8689;

0.8679;

0.8809;

0.875;

0.881;

0.9385;

0.9068;

0.9084;

0.8797;

0.8795;

0.8776;

0.8578;

0.8466;

0.8253;

0.7819;

0.8726;

0.8555;

0.8017;

0.8326;

0.7391;

0.8743;

0.8716;

0.86;

0.852;

0.8572;

0.8515;

0.836;

0.8242;

0.8165;

0.8134;

0.8012;

0.7998;

0.7818;

0.7837;

0.8716;

0.7963;

0.7818;

0.8504;

0.8487;

0.8431;

0.8453;

0.8344;

0.8377;

0.8227;

0.836;

0.8196;

0.827;

0.8323];

我有一组这样的数据，想拟合成一个四元非线性的公式，但是不知道公式的形式，我怎么样做，才能是拟合的效果比较好？谢谢了

[本帖最后由 mooni 于 2009-3-29 16:41 编辑]