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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.

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Abeles - specular Neutron/Xray reflectivity curve simulation

Last changed: 15 weeks 3 days ago

This XOP generates neutron/Xray specular reflectivity curves from parameters that describe a scattering length density profile at an interface. The XOP is intensively used by the Motofit reflectivity fitting package.

  • multithreaded
    • VersionDateLinksStatus
    IGOR.5.00.x-5.x-dev2009-Nov-24Development snapshot for Igor 5.00.x and aboveHelp
    Categories:

    An interior-point gradient method for large-scale totally nonnegative least squares problems

    Last changed: 27 weeks 4 days ago

    Igor code for solving NNLS problems, coded using: http://www.caam.rice.edu/~zhang/reports/tr0408.ps (Michael Merritt and Yin Zhang, Technical Report TR04-08, Department of Computational and Applied Mathematics, Rice University, Houston, Texas 77005, U.S.A., May, 2004)

    VersionDateLinksStatus
    IGOR.6.00.x-1.12009-Aug-30Recommended for Igor 6.00.x and aboveHelp
    Categories:

    Baseline Fitting

    Last changed: 2 years 20 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.

    VersionDateLinksStatus
    IGOR.6.02.x-1.1.0-b2007-Oct-17Recommended for Igor 6.02.x and aboveHelp
    Categories:

    Baseline Spline Fit

    Last changed: 6 weeks 23 hours 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.

    VersionDateLinksStatus
    IGOR.6.10.x-2.02010-Jan-28Recommended for Igor 6.10.x and aboveHelp
    IGOR.6.02.x-1.3.02007-Oct-17Recommended for Igor 6.02.x and aboveHelp
    IGOR.6.01.x-1.4.12007-Oct-17Recommended for Igor 6.01.x and aboveHelp
    Categories:

    GenCurvefit

    Last changed: 16 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.

    VersionDateLinksStatus
    IGOR.5.04.x-1.4.x-dev2009-Nov-19Development snapshot for Igor 5.04.x and aboveHelp
    Categories:

    Maximum Entropy Fitting package

    Last changed: 1 year 39 weeks 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.

    VersionDateLinksStatus
    IGOR.6.02.x-1.02008-Jun-09Recommended for Igor 6.02.x and aboveHelp
    Categories:

    Photoemission pair fitting

    Last changed: 2 years 20 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.

    VersionDateLinksStatus
    IGOR.5.00.x-0.1.02007-Oct-17Recommended for Igor 5.00.x and aboveHelp
    Categories:

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