pos function does not work

Hi, In the following link: https://in.mathworks.com/matlabcentral/answers/889452-how-to-get-brushed-data-point-index-from-plot How do I use the pos function? Any specific toolbox I should have? It does not work for me (unrecognised function or variable).

[Torsten]

Can you give a link to this function ? I cannot find it.

[John D'Errico]

@Torsten - do a search on the FEX for pos. I did, but there are many possible candidates. My best guess is the kinematics TB, since many students seem to be doing kinematics lately.

Answer 1

[John D'Errico]

Now that we see what is meant by pos, we see that in fact, pos is just an array. It is not a function at all.

https://in.mathworks.com/matlabcentral/answers/889452-how-to-get-brushed-data-point-index-from-plot

In that post, pos was just presumed to be a list of the coordinates of a set of points in a 3-dimensional space.

Answer 2

[John D'Errico]

which pos

'pos' not found.

We cannot tell you how to use a function that does not exist in MATLAB.

Is pos a function that would be found on the file exchange? Maybe. A short name like that may have been used multiple times,

Maybe it is a function from the kinematics toolbox.

https://www.mathworks.com/matlabcentral/fileexchange/24589-kinematics-toolbox?s_tid=srchtitle

Should we know? How?

Mybe it is found here:

https://www.mathworks.com/matlabcentral/fileexchange/60974-murphy-diagrams?s_tid=srchtitle

We cannot possibly know which function among many you are thinking about. Or possibly it is a function you or someone you know wrote.

[Ali]

https://in.mathworks.com/matlabcentral/answers/889452-how-to-get-brushed-data-point-index-from-plot

[John D'Errico]

Sigh. In the post you show, Pos is just an array. It is not a function.