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How can I make an exponential fit with offset?

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twig27
twig27 2017-1-26
评论： Star Strider 2018-9-24
Hello, since Matlab does not provide a built-in exponential fit function with an offset I would like to create one by myself. I use the Curve Fitting Tool and enter as a custom equation: f(x) = a*exp(b*x)+c However the tool is not performing a correct fit. If I use the built-in exponential fit (2 terms) I obtain a smooth fit, where the time constant of the second term is set to zero and thereby creating the correct offset. Do I have to adjust the start values or why is the custom equation not yielding a good fit? Regards

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Star Strider
Star Strider 2017-1-26
The easy way is to create your own anonymous function:
f = @(b,x) b(1).*exp(b(2).*x) + b(3);
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Image Analyst
Image Analyst 2018-9-24
You can use fitnlm() in the attached test.m file.

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