# 请问这样拟合e指数曲线问题在哪里？

21 views (last 30 days)
Answered: starlight Smith on 17 Apr 2022
1. x = 400:0.4:1000;
2. y = pop3;
3. f = fittype('a*exp(-x/b+c)','independent','x','coefficients',{'a','b','c'});
4. x1 = x';
5. y1 = y';
6. ff = fit(x1,y1,f);
7. xi = x;
8. yi = ff(xi);
9. figure
10. plot(xi,yi,'b-',x,y,'g*');
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1. 错误使用 fit>iFit (第 139 行)
2. Y must be a column vector.
3. 出错 fit (第 116 行)
4. [fitobj, goodness, output, convmsg] = iFit( xdatain, ydatain, fittypeobj, ...
5. 出错 eee (第 22 行)
6. ff = fit(x1,y1,f);

starlight Smith on 17 Apr 2022

x = 400:0.4:1000; 它本来是行向量，所以才用 x1 = x'; 来转置成列向量。

ff = fit( reshape( x, [], 1 ), reshape( y, [], 1 ), f )

a * exp( -x / b + c ) = a * exp( -x / b ) * exp( c ) = a * exp( c ) * exp( -x / b ) = ap * exp( -x / b )

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