Error in running “low_rank_tensor_completion_TT.m”

[HF Z]

Dear Manopt team,

Recently I download Manopt 7.1 and run to file ‘run_all_examples.m’ in the ‘examples’ folder (after installing tensor_toolbox-v3.6 and other necessary toolboxes), it reports as follows:

Then I try to run the file “low_rank_tensor_completion_TT.m” individually and it reports as follows

This looks like a bug embedded in this package since I haven’t modified any file, could you please help to fix it?

My laptop is a MacBook with the chip 2 GHz Quad-Core Intel Core i5, my MATLAB version is 2022b. Hope these information can be helpful.

Best,
Hanfeng

[Nicolas Boumal]

Hello Hanfeng,

Thanks for posting with a detailed description of the issue.

For now, I see two possible issues to look into. The file TT_Weingarten.m (link to github) has this documentation (I extended it just now):

% NOTE: this manifold requires the use of a modified version of TTeMPS_1.1,
% which is packaged with Manopt and can be found in
% manopt/manopt/manifolds/ttfixedrank/TTeMPS_1.1
% It also uses some MEX files that you may need to compile by
% running install_mex.m in manopt/manopt/manifolds/ttfixedrank.

I recommend the following:

1) Run the script install_mex.m in that folder.  This should compile the MEX files for your platform. That requires Matlab to have access to a C compiler: you can run "mex -setup" if necessary to install one.

2) We had to modify the toolbox TTeMPS a little bit (you can see the changes here): it's best to use that modified version of TTeMPS when using Manopt. It's packaged with Manopt, so the code is already there: just make sure it's on your Matlab path.

I hope this helps. Let us know if not.

Best,

Nicolas

[HF Z]

Thanks, I just install Xcode15 and then run the script install_mex.m and it works, very nice and quick solution!

For those who may have the same problem as mine, you can refer to

https://www.mathworks.com/support/requirements/supported-compilers-mac.html

for supported and compatible compilers of Mac. Similar webpages for Windows and Linux are also available.

Best,

Hanfeng