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How do I fit a Sinuscurve to my Data-Function, WITHOUT Cftool?

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BrunoChemie
BrunoChemie on 16 Apr 2021 at 8:00
Answered: Star Strider on 16 Apr 2021 at 12:24
C = dlmread('Spektra_Spektrometer2_p.txt.','\t','A3..B652');
x1= C(:,1);
y1= C(:,2);
[fitresult,gof]= sinFit(x1,y1);
i am Missing this. How do I get those numbers that define the Sinusfit
spek2 = dlmread('Spektra_Spektrometer2_p.txt','\t','A3..B652');
x1 = spek2(:,1);
y1 = spek2(:,2);
[fitresult,gof]= sinFit(x1,y1);
phi = -348.3; %how do i get this??
yfit = -0.28*sin(0.016*x1+phi)+1.284; %how to i get this??

Answers (1)

Star Strider
Star Strider on 16 Apr 2021 at 12:24
See if the approach in Curve fitting to a sinusoidal function will do what you want. It uses only core MATLAB functions, no toolboxes.

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