Install libarmadillo-dev by entering the following commands in the terminal:
sudo apt update sudo apt install libarmadillo-dev
Description:
streamlined C++ linear algebra library - Headers
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.
Homepage: http://arma.sourceforge.net/
Version: 1:8.400.0+dfsg-2
Section: universe/libdevel