2楼: Originally posted by claymore88 at 2012-07-30 09:57:55
以前自己也碰到跟楼主类似的问题，不过简化了很多..而且也基本清楚参数的范围. 把y移过去，然后在一定的范围内取不同的参数值，比如a，b，c，f，k。把这些值代入求计算值与y值的差值，然后看哪些值的差值最小...

Constant
d1=[341,567,744,417,356,653,238,695,290,297,183,58,404,101,406,681,478],
p1=[857,2905,20,2280,1111,11915,793,1311,366,888,446,53,4577,72,347,4998,159],
d2=[541,565,372,398,301,431],
p2=[6550,3312,576,3263,10522,2305];
Constant x11=1,x21=23,x12=3,x22=32,y1=677,y2=2109;
MinFunction  sqr(y1-(Sum(i=1:17)(p1[i]*exp(a-b*d1[i])/(1+exp(a-b*d1[i])))+c*x11*Sum(i=1:17)(p1[i])+f*x21*Sum(i=1:17)(p1[i])+k*Sum(i=1:17)(p1[i])))+
             sqr(y2-(Sum(i=1:6)(p2[i]*exp(a-b*d2[i])/(1+exp(a-b*d2[i])))+c*x12*Sum(i=1:6)(p2[i])+f*x22*Sum(i=1:6)(p2[i])+k*Sum(i=1:6)(p2[i])));