Struct FrequencyGrid

pub struct FrequencyGrid {
    pub x: Vec<f64>,
    pub dx: Vec<f64>,
    pub x_half: Vec<f64>,
    pub x_half_cubed: Vec<f64>,
    pub n: usize,
}

The frequency grid with precomputed helper arrays.

Fields

x: Vec<f64>

Grid points x_i

dx: Vec<f64>

Grid spacing dx_i = x_{i+1} - x_i (length n-1)

x_half: Vec<f64>

Cell-center values: x_{i+1/2} = (x_i + x_{i+1}) / 2 (length n-1)

x_half_cubed: Vec<f64>

Precomputed x_half[j]³ (length n-1).

n: usize

Number of points

Implementations

impl FrequencyGrid

pub fn from_points(x: Vec<f64>) -> Self

Build a FrequencyGrid from a sorted vector of grid points.

Panics

Panics if x has fewer than 2 elements.

pub fn new(config: &GridConfig) -> Self

Create a frequency grid from configuration.

Uses logarithmic spacing for x < x_transition and linear spacing above, with a smooth blending zone around x_transition. The blending uses a cubic Hermite (smoothstep) interpolation of the local spacing, avoiding the discontinuous 30× jump in dx that a hard log-to-linear transition would produce. This improves local truncation error near x_transition.

pub fn log_uniform(x_min: f64, x_max: f64, n: usize) -> Self

Create a purely logarithmic grid (useful for testing).

Panics

Panics if n < 2.

pub fn uniform(x_min: f64, x_max: f64, n: usize) -> Self

Create a uniform grid (useful for testing).

Panics

Panics if n < 2.

pub fn find_index(&self, x_target: f64) -> usize

Find the index of the grid point closest to a given x value.

Trait Implementations

impl Clone for FrequencyGrid

fn clone(&self) -> FrequencyGrid

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for FrequencyGrid

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.