# f2py_constants

Fortran module: `f2py_constants`

## Parameters

User-configurable parameters (can be set via `param_dict`):

| Parameter | Type | Default | Description |
|-----------|------|---------|-------------|
| `coolant_active` | `int32[(7,)]` | `array(7,)` |  |
| `coolantdatadir` | `<class 'numpy.ndarray'>` | `b'/opt/hostedtoolcache/Python/3.12.13/x64/lib/python3.12/site-packages/uclchem/data/collisional_rates/                                                                                                                                                            '` |  |

## Constants (Read-Only)

Fortran PARAMETER constants (compile-time values):

| Constant | Type | Value |
|----------|------|-------|
| `coolantconversionfactors` | `float64[(7,)]` | `array(7,)` |
| `coolantconversionmode` | `int32[(7,)]` | `array(7,)` |
| `coolantfiles` | `bytes120[(7,)]` | `array(7,)` |
| `coolantnames` | `bytes32[(7,)]` | `array(7,)` |
| `coolantparentnames` | `bytes16[(7,)]` | `array(7,)` |
| `max_coolants` | `<class 'numpy.ndarray'>` | `7` |
| `missing_value_float` | `<class 'numpy.ndarray'>` | `-1.0` |
| `missing_value_integer` | `<class 'numpy.ndarray'>` | `-1` |
| `n_dvode_stats` | `<class 'numpy.ndarray'>` | `19` |
| `n_physics_params` | `<class 'numpy.ndarray'>` | `11` |
| `n_se_stats_per_coolant` | `<class 'numpy.ndarray'>` | `3` |
| `n_total_levels` | `<class 'numpy.ndarray'>` | `108` |
| `ncoolants` | `<class 'numpy.ndarray'>` | `7` |
| `no_reactant_or_product` | `<class 'numpy.ndarray'>` | `9999` |
| `nreac` | `<class 'numpy.ndarray'>` | `3421` |
| `nspec` | `<class 'numpy.ndarray'>` | `335` |
| `suggested_freq_rel_tol` | `<class 'numpy.ndarray'>` | `0.009999999776482582` |

## Runtime Access

Access `f2py_constants` parameters at runtime using `uclchem.advanced.GeneralSettings()`.
See [Accessing Fortran Parameters](index.html#accessing-fortran-parameters-at-runtime) on the main Fortran API page for examples.