# Does curve fitting toolbox support 3D points?

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Hi, I am beginning to use curve fitting toolbox. I read the document about the functions, however I find the functions are defined to fit 2D points. Currently I have to fit one curve for a 3D data set. I don't find any example code that fits 3D points. Many users need to fit 3D data set. Can anyone give me some advice or link to show how to use curve fitting toolbox for 3D points.

Regards Jogging

##### 3 Comments

### Answers (2)

Sean de Wolski
on 10 Sep 2014

lsqcurvefit in the Optimization Toolbox or NonLinearModel.fit in the Statistics Toolbox.

##### 3 Comments

Matt J
on 12 Sep 2014

Edited: Matt J
on 12 Sep 2014

It may help a lot if people try to use curve fitting for 3D points.

Fitting a 3D spline [x(t), y(t), z(t)] is the same as doing 1D spline fits separately to x(t), y(t), and z(t). It doesn't require any new functionality. Also, as noted at the link you posted, there are already many tools for doing this kind of fitting freely available on the File Exchange, so there is less reason for MathWorks to try to sell their own.

I don't understand that three components are functions of the distance between points.

You want the curve [x(t),y(t),z(t)] to be traversed as t increases from 0 to something. The above is just one possible way of defining a range for the parameter t.

Marc
on 14 Sep 2014

##### 2 Comments

VIGNESH BALAJI
on 20 Jul 2023

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