Ability to do all-at-once fitting from the Curve Fitting dialog

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It'd be fantastic to be able to run all-at-once fits from Analysis > Curve Fitting... .

Thanks.
Analysis->Curvefitting does to all-at-once fits, if you have an all-at-once function:

Function mystraightline(w, yy, xx):fitfunc
Wave w,yy,xx
yy=xx*w[0] + w[1]
End


However, the Curvefitting dialogue does not handle fits that have more than one independent variable, or structure fits.

June 9, 2010 at 10:56 pm - Permalink

Sorry, I terribly mis-stated the problem. The dialog doesn't seem to support the "_default_" coefficient wave option on the Coefficients tab. I always get "Igor can't tell how many coefficients the fit function requires. Select a wave from the Coefficient Wave menu." It seems like Igor doesn't process the comment info in the "//CurveFitDialog/" format when the function is all-at-once.

You are absolutely right -- the Curve Fitting dialog can run all-at-once fits as long as you select a pre-existing coefficient wave. You will not see the "human-readable" name of each coefficient, though, which is a major bummer when you have a complicated function.

June 9, 2010 at 11:28 pm - Permalink

nplumb wrote:
Sorry, I terribly mis-stated the problem. The dialog doesn't seem to support the "_default_" coefficient wave option on the Coefficients tab. I always get "Igor can't tell how many coefficients the fit function requires. Select a wave from the Coefficient Wave menu." It seems like Igor doesn't process the comment info in the "//CurveFitDialog/" format when the function is all-at-once.

You are absolutely right -- the Curve Fitting dialog can run all-at-once fits as long as you select a pre-existing coefficient wave. You will not see the "human-readable" name of each coefficient, though, which is a major bummer when you have a complicated function.


Yes, the dialog actually parses the code to figure out how many fit coefficients it has. The parsing code doesn't understand the format of an all-at-once fit function.

It really should fall back on the comments, though. I will add that to my to-do list.

John Weeks
WaveMetrics, Inc.
support@wavemetrics.com

June 10, 2010 at 04:50 pm - Permalink

Sorry to dig up this old post. But has there been an update in the ability to tell the Curve Fit dialog (and by extension FuncFit) about the coefficients in an all-at-once fit function? "//CurveFitDialog/" parsing seems to be still on a ToDo list, right?

November 20, 2024 at 07:25 pm - Permalink