有七组数据(1,50)：

x=[ 13.4171 5.652496 7.560203 7.005844 11.98577 7.746066 10.69772 8.115705 14.04746 10.89177 8.992618 13.90936 6.104227 11.04632 5.09778 14.52481 5.335827 13.0791 14.87349 14.3976 11.20755 12.17703 12.58266 13.35924 10.21974 10.05237 6.867071 14.73595 5.827311 6.744245 9.221352 7.930751 12.29883 12.95581 9.743007 12.78074 9.178185 7.266833 6.539749 8.639562 9.806108 11.74881 8.500004 8.295984 10.58094 11.52197 5.523533 9.571888 6.361098 13.71534];

y=[6.190326 8.584066 14.81054 8.747572 11.45382 7.284567 10.70957 11.98855 6.683549 6.99661 13.86029 5.74022 11.73327 12.10783 14.33962 6.533306 8.835626 10.4256 9.599816 7.034224 11.20652 6.31224 12.37637 12.73384 7.638087 13.07378 12.49215 9.196328 10.23128 5.971105 7.528953 10.87525 13.43818 8.285651 9.296404 14.42412 14.1179 14.64524 7.876924 8.116597 9.850361 11.05809 5.523418 9.653056 12.96488 5.396533 5.14605 13.26878 13.71681 10.02155];

z=[10.85096 13.24481 10.53357 10.76888 8.068892 12.9561 12.73507 10.20134 6.720434 7.677354 7.983198 5.60023 11.49249 14.28487 11.09218 6.154032 11.26449 5.156948 8.694271 14.00715 14.83517 9.944352 13.4947 13.63054 7.268225 9.521478 9.038349 7.147685 6.84857 11.98348 8.853812 8.5531 9.237732 5.2575 5.818223 14.51524 13.13667 9.709319 14.68515 11.72889 5.529524 12.1358 6.527157 6.389035 13.84179 7.541856 12.24725 8.223879 12.52146 10.09003];

u=[0.036695 0.0883 0.019172 0.068524 0.002089 0.00551 0.090486 0.006885 0.017376 0.012718 0.099473 0.050789 0.065367 0.047408 0.094885 0.014039 0.010662 0.052849 0.044541 0.000394 0.023643 0.05686 0.087776 0.082782 0.029538 0.062794 0.041617 0.07151 0.072755 0.066432 0.009581 0.027899 0.074655 0.061343 0.080877 0.049667 0.031538 0.096335 0.059724 0.02198 0.093029 0.039769 0.033176 0.07631 0.0544 0.084814 0.025497 0.079651 0.03558 0.042637];

v=[0.017105 0.00326 0.028064 0.065229 0.058725 0.082099 0.038979 0.000385 0.096246 0.070411 0.030293 0.060378 0.090085 0.07327 0.098564 0.049077 0.00939 0.094998 0.007072 0.03489 0.010248 0.068981 0.025706 0.063748 0.050541 0.026417 0.05313 0.013281 0.078834 0.066412 0.043896 0.020164 0.088211 0.092284 0.014333 0.033242 0.077147 0.044104 0.087862 0.085457 0.055476 0.056127 0.019721 0.023869 0.037969 0.075718 0.081571 0.005027 0.040355 0.046797];

w=[0.01179 0.012143 0.050485 0.066108 0.014883 0.094027 0.087794 0.098393 0.026187 0.028615 0.022912 0.082203 0.071991 0.064664 0.076595 0.042124 0.090596 0.088093 0.033011 0.053523 0.063262 0.05418 0.072162 0.097554 0.08181 0.003068 0.092218 0.001652 0.074676 0.038588 0.059493 0.030021 0.078097 0.035336 0.021207 0.057052 0.025459 0.009415 0.045563 0.040576 0.037385 0.069113 0.084793 0.060123 0.01756 0.006675 0.049216 0.005483 0.01821 0.046256];

s=[7.1626 7.9693 6.3014 5.2549 6.8745 5.8324 5.2192 6.4526 5.0293 5.8831 5.8485 3.9156 5.1738 5.9575 5.1283 5.0312 6.0007 3.7509 5.8011 7.218 6.0986 4.9779 5.5754 5.0313 4.2807 7.7049 4.6252 6.3978 4.5553 6.7706 5.8178 6.9649 5.3821 4.7814 5.9532 5.9884 7.0334 6.8784 7.0624 6.1372 4.9247 5.2598 4.728 5.7077 7.4895 6.1215 6.9607 7.135 6.9888 5.0421];

现在想要拟合一个s=a0+a1*x+a2*y+a3*z+a4*u+a5*v+a6*w+a7*x*y+a8*x*z+a9*x*u+a10*x*v+a11*x*w+a12*y*z+a13*y*u+a14*y*v+a15*y*w+a16*z*u+a17*z*v+a18*z*w+a19*u*v+a20*u*w+a21*v*w+a22*x^2+a23*y^2+a24*z^2+a25*u^2+a26*v^2+a27*w^2这样的函数，请教一下该怎么编程呢，cftool是不是只能做两个自变量的函数拟合？