Matlab 2023b testFeval.exe produces no output

I followed instructions at:

https://www.mathworks.com/help/matlab/matlab_external/test-your-build-environment.html#

The module built with no warnings and no errors.

However, when I call the program: !testFeval.exe

No output is produced. No errors and no warnings still.

Answer 1

[檮杌]

Would you run MATLAB as administrator and see if it works for you?

[James Prewitt]

I just logged on and will try to run as administrator and will then update comments.

Thank you very much for verifying the behavior.

[James Prewitt]

I started up Matlab 2023b as Administrator.

...

>> !testFeval.exe

>>

As you can see, there is still no output.

[檮杌]

Are you sure you have set up the runtime environment as described in the doc?

[James Prewitt]

I have created a number of mex related files that have run just fine and product the expected output.

The "testFeval.exe" was created just fine with no errors/warnings.

However, when I followed your advice and added C:\Program Files\MATLAB\R2023b\extern\bin\win64

to end of System variable "Path".

I now get the desired result:

>> !testFeval.exe

Square root of -2 is 0 + 1.41421i

Square root of 2 is 1.41421 + 0i

Square root of 6 is 2.44949 + 0i

Square root of 8 is 2.82843 + 0i

>>

I do not understand why I was able to create mex files and got the expected results.

What is different about about this command? Is there a short answer or a document you could send me a link to that will explain why I needed to add this to the path and why the normal installation script did not automatically modify the path?

Thank you very much for your help.

[James Prewitt]

OK, I now see where the instructions say to modify the "path" variable.

I wonder why the install software does not automatically do this for you.

Thanks again.

This solves my problem...

[檮杌]

This may be related how the function system works (or bang operator, "!"). In general, adding a specific path to PATH instructs OS which folder to refer in order to run commands. However, it is not allowed to look inside the MATLAB function system. Hence, we do not know exactly why we need to add the path but we can only follow the instruction by MW DEV.

Moreover, running mex has nothing much to do with system. I believe they are separately designed. If you do not want to add the path to PATH, you can open the exe file in your cmd. This should work too.

Please accept the answer if it helped. Thanks.