I actually meant syntax-wise. I know what values I would like to use as start points, but how can I implement them in my code?
Setting your own start points for curve fitting
100 views (last 30 days)
Show older comments
I have a set of data which I am attempting to fit via a modified ("custom") two-exponential function: a*exp(b*(x-x0))+c*exp(d*(x-x0))+y0, where x0 and y0 are known. I know how to set upper and lower bounds for a,b,c,d, but how can I specify starting values (start points) for them?
Thanks in advance.
3 Comments
Adam Danz
on 27 Jun 2018
Edited: Adam Danz
on 27 Jun 2018
I see, what function are you using to do the fitting? For most of matlab's fitting functions, the 2nd input is "x0" which is a vector of values [1-by-n] for the n parameters of the function you're fitting. If the parameters in your function are [a,b,c,d] with an expected outcome of [100, 20, .5, -2], then that vector would be the input to 'x0'.
Accepted Answer
Walter Roberson
on 27 Jun 2018
If you are using fit() then use the InitialPoint option as shown in https://www.mathworks.com/help/curvefit/fit.html#bto2vuv-10
0 Comments
More Answers (0)
See Also
Categories
Find more on Get Started with Curve Fitting Toolbox in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!