U++ framework: ScatterDraw & ScatterCtrl » Added GuessCoeff() to improve Fit() performance

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Added GuessCoeff() to improve Fit() performance [message #44229]

Mon, 02 February 2015 09:24

koldo
Messages: 3461
Registered: August 2008

Senior Veteran

Fit() permits to adjust a series of data to a function through regression analysis.

As Fit() is for general use, it does not know special properties of equations to be fitted. This could be a problem if the initial conditions are not properly set, so in many cases Fit() will not converge.

To solve this it has been added GuessCoeff(). It permits to guess a proper initial conditions to let Fit() adjust successfully.

For example, SinusEquation represents y = offset + A*sin(w*t + phi) equation, and now includes GuessCoeff(). This helps to fit raw data like shown here:

index.php?t=getfile&id=4720&private=0

Attachment: img.jpg
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Best regards
Iñaki

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