如何用matlab求出非线性方程的系数?

如题所述

第1个回答  2011-07-14
数据为 t=[0.1,1.1,2.3,3.4,4.5,5.7,6.7]; y=[0,94.0,84.0,77.0,69.0,62.0,56.0];
所求函数形式为 Ae-βt cos(wt+Φ) 最后要求出β的值 (-βt 为e的上标,即e指数形式)
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将Logistic模型的方程变为y=b/(1+a*exp(-kt)),已知t=[0,5,10,24,33,48,57,72,96,120,144,168,192,216];y=[0,0.028,0.103,0.336,0.450,0.597,0.716,0.778,0.835,0.849,0.816,0.839,0.811,0.816].怎么求出参数a,b,k的值

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