Fit experimental data is easy

pbest=easyfit(x,y)

Description

pbest=EASYFIT(x,y,varargin)

 fits the data Y = f(X) to a model function Y = FUN(P,X).
If FUN is not given as an input argument, POLYFIT is used as the model function.
Bounds on the parameters P may be set.
By default a plot is generated which presents the data as well the "best" curve, confidence intervals for data% and the uncertainties for the parameters. For programmatic purposes, this graphical mode can be switched off.

• MATLAB release: MATLAB 7 (R14)

[Duane Hanselman]

>> help easyfit does not provide anything helpful. No description of input arguments. No error checking. Does not add value. Please consider removing this file or make signficant changes to it so it is useful and helpful.

[Jean-Luc Dellis]

Whithout response of Duane Hanselman to my email, I place it here:
>>help easyfit does not provide anything helpful.

This has been corrected.

>>Does not add value. Please consider removing this file or make signficant changes to it so it is useful and helpful.

Yes, there is no original or complex algorithm (the code itself takes exactly 7 lines!), just a useful application of nested functions as described by the Matlab Help itself. From this point of view Duane is right.
But, with its simplicity and the given examples, easyfit can be a great help for users who whish to fit experimental data and are not experts (as Duane) in Matlab.

[gok gok]

i'm a new to this process.
need more info: what are pinit, fhandle for?

[Tie Ling]

I am a new user of Matlab. I will apply the mathematical model by using Matlab to match my experiment. This is very useful for me! Thank you very much!
Another question is: do you have some other example to show how to modify mathematical parameters to better match experiment data? I really need it!
Thanks again!

[Tie Ling]

I am a new user of Matlab. I will apply the mathematical model by using Matlab to match my experiment. This is very useful for me! Thank you very much!
Another question is: do you have some other example to show how to modify mathematical parameters to better match experiment data? I really need it!
Thanks again!

[Phil Wissgott]

good work, but comments are suboptimal. LB and UB have to be the same size as pinit not x0(notation mismatch).
Thank you for your effort
Phil

[Jean-Luc Dellis]

Hello all, that function can only handle REAL vectors X and Y. EASYFIT is like NLFIT from the stats tool box, but easier to use for not-expert-in-matlab. Have a look on the given examples. Regards.