quaternions, a FORTRAN90 code which carries out some simple arithmetic operations for quaternions.
Rotations in 3D can be represented in a number of ways, including quaternions, a rotation matrix, and a combination of a rotation axis and rotation angle. This library includes functions to convert a rotation from one representation to another, and to apply a rotation to a given vector.
The computer code and data files described and made available on this web page are distributed under the MIT license
quaternions is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.
C8LIB, a FORTRAN90 code which implements certain elementary functions for double precision complex (C8) variables;
complex_numbers_test, a FORTRAN90 code which demonstrates some simple features involved in the use of complex numbers in MATLAB programming.
I4LIB, a FORTRAN90 code which contains many utility routines, using "I4" or "single precision integer" arithmetic.
R8LIB, a FORTRAN90 code which contains many utility routines, using "R8" or "double precision real" arithmetic.