Define multiple starting points for two-exponential curve fitting (Curve Fitting Toolbox)
4 views (last 30 days)
Show older comments
Hi,
I have a set of data on which I need to use the two-exponential decay model 'exp2' from the Curve Fitting Toolbox. When I attempted to call the "fit" function ( f=fit(xCol,yCol,'exp2','StartPoint',[maxX,maxY])), MATLAB told me I needed 4 starting points for this model. What is the proper syntax for specifying these? I tried:
f=fit(xCol,yCol,'exp2','StartPoint',[maxX1,maxY1,maxX2,maxY2,maxX3,maxY3,maxX4,maxY4])), but MATLAB told me I had too many start points.
Thanks in advance!
0 Comments
Accepted Answer
Adam Danz
on 26 Jul 2018
If you're fitting a 2-term exponential model such as
f2(x) = a*exp(b*x) + c*exp(d*x)
you'll need 4 starting points (a,b,c,d). In your examples above, you provide 2 and 8 starting points. Your formatting them correctly into a vector but you just need 4 of them.
0 Comments
More Answers (0)
See Also
Categories
Find more on Linear and Nonlinear Regression 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!