Random fitting when use fittype function in Toolboxes

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Fan Li
Fan Li 2020-10-5
评论： Fan Li 2020-10-5
Hi Matlab users
I am working on the data fitting by fittype function in Toolboxes. Basically, I have a set of data, x and y. I want to fit it with a function I defined. After I went through the document of fittype, I managed to get it work. However, I found that the fitting process is out of my control. I run the same code without changing anything, and the output of the fitted curve is quite different. The fitted results are listed below.Also, I got a warning from matlab "Start point not provided, choosing random start point." Not too sure they are related or not. My question is how to control the fitting process so that I can get the best fit like the first plot?
First run
Second run
Third run
Any help would be appriciated.

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Cris LaPierre
Cris LaPierre 2020-10-5
They are absolutely related. It is the randomly selected start point that is leading to you getting different results each time. See this post.

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