谁能帮我解logistic方程参数!。
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时间t(2.2,4.2,6.6,8.6,9.9,11.2,14.2) 水稻叶面积指数y(0.141736,1.062766,4.932433,8.435737,9.049755,7.315956,3.503462),建立叶面积指数的普适增长模型,其表达式为logistic方程修正式:y=c/(1+exp(a*t^2+b*t+d)),怎样求出c,a,b,d参数啊,跪求程序!
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