How can i manipulate c code generated from MATLAB Coder?(DLL)

Hello everyone!

I have a matlab project, which consists of a main function and many outsourced subfunctions.I would like to execute this project in c for better performance. I have used the following work instruction:

https://de.mathworks.com/help/coder/ug/use-a-c-dynamic-library-in-microsoft-visual-studio-project.html

(I used the Matlab coder, to write c functions using DLL)

The matlab coder then outputs the corresponding functions translated into c. The procedure works, but the most computationally intensive part of the program, a matrix inversion, still takes a lot of time. that's why I want to rewrite the files generated by the coder so that they do the matrix inversion through the "eigen-library".

For whatever reason, the change i make to the inv.c file has no effect on the execution of the created project in visual studio. Even if I add an error that should make the inv.c function not work at all, the matrix inversion is executed normally, as if I had not made any changes at all.

Now my question is how I can manipulate this generated c code so that the change takes effect in the created project.

And if you know another way to execute a matrix inversion more efficient than MATLAB, please let me know too!

Thank you and happy holidays!

Answer 1

[David Fink]

MATLAB Coder can be configured to use BLAS and LAPACK calls in generated code, which can improve the performance of linear algebra operations like matrix inverse:

https://www.mathworks.com/help/coder/ug/speed-up-matrix-operations-in-generated-standalone-code-by-using-blas-calls.html

https://www.mathworks.com/help/coder/ug/generate-code-that-calls-lapack-functions.html

However, note that solving systems of equations Ax = b via \ (mldivide) can be more accurate and efficient than using inv:

https://www.mathworks.com/help/matlab/ref/mldivide.html#bthh_f9