# Fortran Core API Reference

The Fortran core elements have been fully documented and compiled using **FORD** (FORtran Documenter), which extracts comments (`!>` and `!!`) and draws rich module dependency graphs.

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### Core Modules Cataloged

- **[[Compact]]**: Solves compact finite difference scheme equations using high-order tridiagonal/pentadiagonal schemes.
- **[[m_calculate]]**: Runs budget calculations, spatial derivatives, and pieces Arrhenius chemical kinetics.
- **[[m_arrays]]**: Handles array allocations and instant budget memory blocks.
- **[[m_openmpi]]**: Wraps domain sizing, grid splitting, and MPI communicators.
- **[[m_parameters]]**: Loads physical settings, boundary configurations, and grid sizes from file inputs.
- **[[post]]**: Entry driver performing budget calculation run tasks.