Packages: Curve Fitting
Packages include individual Igor procedure files or collections of Igor procedure files that are related, as well as external operations (XOPs). To browse ALL projects (including those that have not been officially released) click on the Advanced Browse link above.
Baseline Fitting
Last changed: 1 year 5 weeks ago
A baseline fitting utility for spectral data. Adds some items to the macros, marquee and trace popup menus. Use the all traces (shift-click) popup menu to fit baselines to many traces at once. To use the utility, make a plot of your raw data, initialise the baseline fit, select areas of the data with a marquee and right click for the option to add those regions to a maskwave. You can fit a line, 3rd or 4th order polynomial, Gaussian, Lorentzian or exponential curve or a smoothed spline to the selected regions and subtract the baseline via macro, trace or marquee menus.
| Version | Date | Links |
|---|---|---|
| IGOR.6.02.x-1.1.0-b | 2007-Oct-17 |
Baseline Spline Fit
Last changed: 1 year 5 weeks ago
For fitting baselines to vibrational spectra by eye ("flexi-curve" fitting). The easiest way to do this is to chose some node positions and fit a spline through the nodes. This Igor procedure file adds an interactive baseline fitting mode. Some submenus are added to the macro menu, including an option to subtract the baseline from the data.
Usage
Initialise from the macros menu, then use ctrl-1 (cmd-1 on the mac) to toggle between drawing mode, where you can drag the nodes, and normal mode, where you can interact with the graph in the usual way.
| Version | Date | Links |
|---|---|---|
| IGOR.6.02.x-1.3.0 | 2007-Oct-17 | |
| IGOR.6.01.x-1.4.1 | 2007-Oct-17 |
GenCurvefit
Last changed: 7 weeks 22 hours ago
GenCurvefit uses differential evolution (genetic optimisation), with a user defined fit function, to fit data with up to 50 independent variables. The technique is extremely good at finding global minima in Chi^2, even with poor starting guesses.
Copyright - Andrew Nelson and the Australian Nuclear Science and Technology Organisation 2007.
| Version | Date | Links |
|---|---|---|
| IGOR.5.04.x-1.4.x-dev | 2008-Oct-02 |
Maximum Entropy Fitting package
Last changed: 23 weeks 4 days ago
This is Maximum Entropy Package for solving problems which can be written as linear equation: I = G f, where I is measured signal, G is response matrix and f is a model distribution. It has been used for interpretation of a size distribution from small-angle scattering data, which involves the inversion of an integral equation for which there is no exact solution. It can likely be used for number of similar problems.
| Version | Date | Links |
|---|---|---|
| IGOR.6.02.x-1.0 | 2008-Jun-09 |
Photoemission pair fitting
Last changed: 1 year 5 weeks ago
A very old, as-is, you are on your own, your milage may vary version of multi-peak fitting for special voigt pairs that occur in photoemission work.
| Version | Date | Links |
|---|---|---|
| IGOR.5.00.x-0.1.0 | 2007-Oct-17 |