This library provides abstract types to represent mathematical fields in Fortran. These are both scalar and vector fields. It also contains (at present) one concrete implementation of these types, using a pseudo-spectral approach and tracking field values at Chebyshev collocation points.

• abstract types representing vector and scalar fields
• concrete implementations of said types
  • 1D implementation using Chebyshev pseudo-spectral techniques (in progress)
  • 2D implementation using Chebyshev pseudo-spectral techniques
  • 3D implementation using Chebyshev pseudo-spectral techniques
  • implementations of special "uniform" fields which provide optimal use of memory and CPU
• implementation with periodic boundary conditions (Fourier spectral approach?)
• Factory type or method to provide uniform constructor for implementations
• Front-end nonlinear solver for fields?
• Parallel implementations (for multidimensional fields)
• Derived type to represent boundary conditions, with procedure pointer to generate said conditions?
• Equality checking of fields, within a tolerance
• Ability to set tolerance on a per-field basis

FACTUAL is licensed under the GNU General Public License (GPL) v3.0 or later. The terms are provided in the file LICENSE. The Lesser General Public License (LGPL) would have been used, but the Chebyshev pseudo-spectral implementation uses the FFTW3 library, which is licensed under the GPL.