Invalid MEX-file in Matlab Online

Hi,

I am tring to run a code in Matlab Online recently:

GitHub - ankrh/MCmatlab: Numerical simulation tool for Monte Carlo propagation of light in turbid media

However, when I extracted the files and ran the examples, it always said

"Invalid MEX-file '/MATLAB Drive/Release2/MCmatlab-Release/+MCmatlab/@model/private/MCmatlab.mexa64':

/lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.29' not found (required by /MATLAB

Drive/Release2/MCmatlab-Release/+MCmatlab/@model/private/MCmatlab.mexa64)".

I found solutions like

Invalid MEX File Errors - MATLAB & Simulink

Why do I get a libc.so.6: not found error when launching MATLAB in Ubuntu? - MATLAB Answers - MATLAB Central

But I cannot find a place like CMD or shell in the cloud environment to do the job.

Is there any way to install or link to the library?

Many thanks.

Answer 1

[Divyam]

Hi @Po-Chun,

You can run external commands in MATLAB by using the "!" character as a shell escape character in the MATLAB command line. You can also use the "system" function to run system level commands for your operating system.

!mkdir newdir
system('mkdir newdir')

For more information regarding the use of "!" to run external commands, refer to this documentation: https://www.mathworks.com/help/matlab/matlab_external/run-external-commands-scripts-and-programs.html

For more information regarding the "system" function, refer to this documentation: https://www.mathworks.com/help/matlab/ref/system.html

[Walter Roberson]

You would not use system() to execute a .mex* file. .mex* files are designed to be called directly from MATLAB.

[Divyam]

The system() function is not used for the mex files but for the system commands mentioned in the MATLAB answers in the question.