Interactive Peak Fitter (Version 8.1)

Keyboard operated peak fitting function for time-series signals.

Description

An interactive peak fitting program for time-series signals, written as a self-contained function in a single m-file. Uses a 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, Logistic, exponential pulse, and sigmoid shapes. See http://www.wam.umd.edu/~toh/spectrum/InteractivePeakFitter.htm for more information.

Version 8, April 2012, Added bootstrap
sampling estimation of standard deviations of peak parameters ('v' key).

Press K to list all keyboard commands.

Acknowledgements

The author wishes to acknowledge the following in the creation of this submission:
Interactive Peak Fitter, version 2.2
This submission has inspired the following:
Peak Fitter

• MATLAB release: MATLAB 7.8 (R2009a)

[Tom O'Haver]

This latest version (3.3) add two features:

1. It computes the model at 100 points regardless of number of data points, giving the graph a smoother appearance.

2. A new keypress function, "d", to print out x,y values of the current data segment.

[John D'Errico]

Please do not upload two copies of the same file. If you wish to update a file, then click on the update link on the file page.

Delete one of the copies.

[Wang Hai]

good

[Lissa]

 

[Tom O'Haver]

Version 4: April 2008: Added keypress function "x" to refine the fit by performing 10 trial fits with slightly different first guesses and take the one with the lowest fitting error. You can change the number of trials, "NumTrials", in line 69 (the default is 10)

[Andre Guy Tranquille]

 

[Thomas]

If I will start the interactive peak fitter, I get the following information:

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

Error in ==> InteractivePeakFitter at 22
warning('OFF','Exiting:')

What was my mistake here?
Kindly regards by Thomas

[Tom O'Haver]

Remove (or comment out) the that line from the m-file. Evidently the syntax of that command has changed since my version of Matlab.

[Tom O'Haver]

The new version 4.4 includes several small bug fixes and display improvements. The peak table displayed on the graph after a fit now has column headings.

[Dongsheng]

When I use this to find peaks it always displays a zoomed in area for the fit. How can I show the entire plot with the fits?

[Tom O'Haver]

DongSheng, there is no way to do that in the current version. You can see the fits only in the region fitted. I'll consider adding what you want in a future version. Thanks.

[Tom O'Haver]

Version 5.0 (July 15, 2011) adds: graph of fitted peaks on the full signal display; Y command to display the entire signal full screen without cursors; various UI improvements and bug fixes.

[Tom O'Haver]

Version 5.2 (July 26, 2011) includes bug fixes in the Print peakfit function (W) and exponentially-broadened Gaussian. Re-formats the peak table on the graph.

See http://terpconnect.umd.edu/~toh/spectrum/InteractivePeakFitter.htm

[Tom O'Haver]

Version 5.4 has greater flexibility of data input formats (e.g. it can accept data whose x-axis values are decreasing as well as increasing).

[Tom O'Haver]

Version 5.5 (August 16, 2011) adds equal-width Gaussian and Lorentzian peak shapes and an 8-point baseline subtraction option (expandable to any number of points).

[Mark Shore]

I find the keyboard commands a bit retrograde in 2011, but that is a personal thing.

I haven't explored all the options in detail yet, so the rating is somewhat preliminary.

[mohammad]

perfect Tom

[Tom O'Haver]

Re: Mark Shore's comment. I agree; I guess I'm a retrograde kind of guy. I've considered creating a GUI, but attempts so far have not produced anything I like better than the single-key commands. It's quicker to hit one key than to hold down the Ctrl-key and another key to select a drop-down menu item.

[Ragaar Ashnod]

Why are you using global variables and adjusting the format and warnings displayed?

I'm not going to bother digging everything apart. But the functionality is neat.

[Tom O'Haver]

Just trying to make it work, Ragaar. I'm basically a pragmatist, designing tools from the user's point of view, not a programming purist.