Sine Wave Fitted To Data

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Sine Wave Fitted To Data

This example fits an equation that has a sin function. Three parameters are calculated: Frequency, the frequency of the sine wave; Amplitude, the height of the sine wave, and Offset, the offset above or below the axis about which the sine wave is oscillating. The Sweep statement is used to try different starting values for the Frequency parameter, looking for one that will converge.

Title "Fit a sine wave to data points";
Variables X,Y;
Parameters Offset,Amplitude,Frequency;
Sweep Frequency = 2.4, 2.8, .2;
Function Y = Offset + Amplitude * sin(Frequency * X);
Plot grid;
Data;
[ data goes here ]