How to find the equation of a line for a 3d line plot

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Alex Doyle
Alex Doyle 2018-2-26
回答： Prajit T R 2018-3-1
Hello Matlab community!
I have three variables plotted on a 3-d graph (two position variables and one time variable). In order to calculate the instantaneous velocity--ie the derivative of the line at each point--I need to define the equation of this line.
Does anyone have an idea of how to go about doing this? Google forums haven't helped yet!

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回答（1 个）

Prajit T R
Prajit T R 2018-3-1
It is possible to get the equation of the line using the fit function. Assuming that the two position variables are x and y, and the time variable being t, x=f(t) and y=g(t). You can use the fit function to get the equations for x in terms of t and y in terms of t. The instantaneous velocity can be obtained by using the derivatives of these equations. The Curve Fitting toolbox is well-equipped to help you in your quest. To access the curve fitting tool, type 'cftool' in the command line.
Cheers

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