Best matlab curve fitting functions?

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Andrew 2014-11-21

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https://ww2.mathworks.cn/matlabcentral/answers/163667-best-matlab-curve-fitting-functions

编辑： Star Strider 2014-11-21

采纳的回答： Star Strider

在 MATLAB Online 中打开

I have the following set of data:

x=[0 .1579 .3158 .4737 .6316 .7895 .9474 1.1053 1.2632 1.4211 1.5789 1.7368 1.8947 2.0526 2.2105 2.3684 2.5263 2.6842 2.8421 3]';
fx=[-.3637 .3164 -1.1263 -1.0672 .1076 1.8249 -.1899 1.3484 1.2583 3.2179 1.7378 3.6954 5.1611 6.7646 8.3733 8.1898 7.9968 10.2402 11.5248 16.6505]';

I have to fit a curve to this data, without using matlabs curve fitting toolbox. What are the best built in matlab functions to fit data like this?

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Star Strider 2014-11-21

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There are three other functions you can use to fit nonlinear data: nlinfit (Statistics Toolbox), lsqcurvefit (Optimization Toolbox), and fminsearch (built-in MATLAB function).

Do you have a model you want to fit? (It looks like a noisy exponential function, but the process that created it dictates the model you fit to it.)