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How to fit a helix in 3D using cftool?

Asked by Dario Cortese on 31 Jul 2019
Latest activity Answered by Navya Seelam on 5 Aug 2019
I am trying to fit some helical data to a helical parametric equation, so as to find the pitch, radius and angle with respect to the z-axis.
If I use the cftool, this is what I am allowed to do in terms of customization (see pic below). There is no option for parametric equations, where the z data can be used as a time variable. Is there any way that this can be done? If not, what functions/tools/methods do you suggest?
sample.PNG

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Answer by Navya Seelam on 5 Aug 2019

Hi,
Assuming the helical parametric equations to be
x=a*sin(z)
y=b*cos(z)
z=t
fittype” can be used to assign the model type to fit in order to obtain the parameters a & b.
myfittype=fittype('a*sin(x)');
ft1=fit(z,x,myfittype);
The same procedure can be used to obtain parameter b as well.

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