Interactive Peak Fitter, version 2.2

A peak fitting program for time-series signals.

Description

A peak fitting program for time-series signals, with sliders to adjust the parameters conveniently. Uses an non-linear optimization algorithm to decompose a complex, overlapping-peak signal into its component parts. The objective is to determine whether your signal can be represented as the sum of fundamental underlying peaks shapes. Accepts signals of any length, including those with non-integer and non-uniform x-values. Fits Gaussian, exponentially-broadened Gaussian, Lorentzian, Pearson, and Logistic shapes (expandable to other shapes). Can be operated either by mouse-controlled interactive sliders or by keyboard shortcuts. Includes a self-contained demo. See http://www.wam.umd.edu/~toh/spectrum/InteractivePeakFitter.htm for more information. Version 2.2, May, 2008, computes the area of each component peak using trapezoidal method.

• Acknowledgements: This submission has inspired the following:; Interactive Peak Fitter (Version 7.1)
• MATLAB release: MATLAB 6.5 (R13)

[Belen Rial Franco]

Hi
I am trying this program using a 7.4.0 (R2007a) Matlab version installed under a Intel-based Mac but is not working.

??? Error using ==> warning
Unknown setting or incorrect message identifier 'Exiting:'.

Error in ==> InteractivePeakFitter at 21
warning('OFF', 'Exiting:')

Could you help me?

Thank you very much

[Ann brown]

Works very well, only sometimes it crashes or is very slow. Esspecially the keypressfunctionality sometimes has problems.

[Tom O'Haver]

Ann Brown:

Thanks for the feedback. Can you tell me which operating system and which version of Matlab you use? Also, what error messages you get when the program "crashes"? This information might be useful to me in developing the next version. Thanks.

[Walt Brown]

Thanks for this program is very good. I would like to have a new profile about Doniach-sunjic but I´m not programmer. If you have it, can you send me?

[Greg Fichter]

This has an interesting user interface but the sliders kept crashing. It appears to incorporate John D'Errico's excellent fminsearchbnd function, but his name is clipped from the file. Sorry, but this is pretty shameful plagarism, even if the code worked.

[Tom O'Haver]

I apologize to John D'Errico and to the Matlab File Exchange for failing to attribute the fminsearchbnd function to John D'Errico. I was using an earlier version of fminsearchbnd, file date 6/7/2006. I did not realize that there was a subsequent newer version dated 9/25/2006. Evidently the earlier version did not have his name in the comments - I certainly did not purposefully cut it out. In retrospect I should have been more careful. I'll make the change as soon as practical.

[Manjree Garg]

Hi,

This is a good interface. Is there any way to know how the fitting functions (e.g. Gaussian, Lorentzian etc.) are derived using half-width (which I guess is equal to three Sigma) rather than Sigma?

[Tom O'Haver]

I've added ipf.m, a keyboard-operated version (without the sliders that have been giving some people problems), written as a single self-contained m-file.

[Laurence Lurio]

I could not get this to work. I tried the DemoInteractivePeakFitter program and got an error

??? Error using ==> warning
Unknown setting or incorrect message identifier 'exiting'.

I think this is the same error which Belen Rial Franco got.

[Tom O'Haver]

I've placed an updated version of this file at http://terpconnect.umd.edu/~toh/spectrum/ipf.m
as of December 26, 2008. It removes the "Warning" command that was causing an error in Matlab 7, and it eliminates the warning message about integer indexes with the colon operator. Tom O'Haver

[Andre Guy Tranquille]