Cannot connect to MATLink

[jonluntzel]

Hi, having trouble connecting with 'Needs["MATLink`"] / OpenMATLAB[]', getting these errors: If I ignore the errors it runs indefinitely. Both the files are located in the win64 folder that is in the path. What I tried:

Extracted the MATLink zip file in $UserBaseDirectory and ran regmatlabserver in MATLAB as an administrator, then ran those 2 lines in a notebook. Restarted Mathematica, double checked the added paths were present with 'Environment["PATH"]' and tried again.

I'm using Windows 10 64-bit, Mathematica 12.0, and MATLAB 2018b. I have C:\Program Files\MATLAB\R2018b\bin\win64 and C:...\win64\bin added as path variables. I haven't yet tried reinstalling.

[szhorvat]

Can you show the output of the following, after running it in a newly started Mathematica session?

Needs["MATLink`"]
MATLink`Developer`GetInfo[]

[jonluntzel]

[szhorvat]

I am not immediately sure what is wrong. There are some problems in the PATH setting though, and while these are unlikely to be causing the problem, please do correct them.

• Remove the two C entries and the one empty entry from the PATH
• Remove the two DLL files from the PATH. There should only be directories in there, not files.
• Double check that there are no spaces on either side of the ; separator in the PATH.

Since Window's PATH editor is pretty inconvenient, I find it easy to copy the whole string to a text editor (like Notepad), fix it, then paste it back.

---

In the past, others have reported similar errors when a conflicting DLL was present somewhere in the path. Just in case, please also move all the MATLAB-related entries to right after the last entry starting with C:\Windows\....

[szhorvat]

Remember to fully restart Mathematica (not just the kernel) after editing the PATH, and verify that everything was fixed by looking at the output of GetInfo[].

[jonluntzel]

It works. Much appreciated.