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Re:José Valim Reveals “Project Nx” (Numerical Elixir) [audio] by rkangel on Thursday February 11, 2021 @05:35AM (#26100099)
Two ideas that might help:

Elixir releases are built in and easy to use. You don't have to write an app file directly for instance.

I usually use ports for C interface (rather than NIFs). I have a little boilerplate C and Elixir that I recycle to do the ground work and then it's just your specific implementation detail.

Re:José Valim Reveals “Project Nx” (Numerical Elixir) [audio] by toast0 on Thursday February 11, 2021 @05:19PM (#26108175)
Yeah, so I'd write just as much (or likely more) C code to interface with the library and BEAM as just writing the implementation in C.