Matlab cannot identify the mex function

I am trying to run the symmetry dectection algorithm proposed in the paper "Detecting Symmetry and Symmetric Constellations of Features".

http://www.nada.kth.se/~gareth/homepage/local_site/code.htm

One weird thing happend is that I can perfectly run the code without error in my laptop. But when I copy those file into my desktop computer. The mex function cannot be found. It shows the error message:

Undefined function or variable 'histc_weighted_mex'.

Error in histc_weighted (line 67)
        hist = histc_weighted_mex(x,weights,edges);

Error in linear_hough (line 30)
Hough_im = reshape(histc_weighted(ind_hs,weights,[1:prod(size(Hough_im))]), size(Hough_im));

Error in symmetry (line 82)
        [Hough_im, max_r, max_ang, r, sym_strength] = linear_hough(im,sym_x,sym_y,ang,phase_weight);

I have no idea why this error occur? Can anyone help me?

Both two computer are using MATLAB R2018b

[Walter Roberson]

Are both of them the same class of operating system? Windows mex cannot be used with Linux for example.

Answer 1

[SaiDileep Kola]

You are trying to use mex file generated for mac OS (as I see in the link which you provided) which doesn’t work on platforms other than mac. Since, mex file is platform specific, you can generate mex file again for your platform following the guidelines from the link provided.

https://www.mathworks.com/help/matlab/ref/mex.html

[Kwun Yu Wu]

but both computer are win10 64bit..

[Walter Roberson]

Possibly you generated the .mexw64 on one of the systems, but on the other system it is not on your MATLAB path (that is, you might have copied it, but you possibly did not use pathtool to add it to your path.)

[Kwun Yu Wu]

I just download and run it..

They are all in private folder, which cannot add to the path. But the entry function of mex file (histc_weighted) is also in that folder and I can call it from the outside(linear_hough).

If the entry function can be called from outside, I think the entry function should be able to reference the related mex file under the same directory.

[hao wei]

I met the same problem but in my case, I just

mex private\histc_weighted_mex.c

and then the code is runed succeed.

PS. My computer is win10-64 bit with Matlab 2016B.