libarmadillo-dev - 1:11.4.2+dfsg-1 main

Armadillo is a streamlined C++ linear algebra library (matrix maths)
aiming towards a good balance between speed and ease of use. Integer,
floating point and complex numbers are supported, as well as a subset
of trigonometric and statistics functions. Optional integration with
LAPACK and ATLAS libraries is also provided.
.
This package has the development libraries and headers for Armadillo.