Struct FitParameter 

pub struct FitParameter {
    pub name: Cow<'static, str>,
    pub value: f64,
    pub lower: f64,
    pub upper: f64,
    pub fixed: bool,
}

A single fit parameter with value, bounds, and fixed/free flag.

The name field uses Cow<'static, str> so that static strings (e.g. "U-238", "temperature_k") avoid heap allocation entirely, while dynamic strings from format!() still work via the Owned variant. When a ParameterSet template is cloned per-pixel, Cow::Borrowed names are copied as a pointer+length (16 bytes, no heap) instead of allocating a new String on the heap.

Fields

name: Cow<'static, str>

Parameter name (for reporting).

value: f64

Current value.

lower: f64

Lower bound (f64::NEG_INFINITY if unbounded).

upper: f64

Upper bound (f64::INFINITY if unbounded).

fixed: bool

If true, parameter is held fixed during fitting.

Implementations

impl FitParameter

pub fn non_negative(name: impl Into<Cow<'static, str>>, value: f64) -> Self

Create a new free parameter with non-negativity constraint.

pub fn unbounded(name: impl Into<Cow<'static, str>>, value: f64) -> Self

Create a new free parameter with no bounds.

pub fn fixed(name: impl Into<Cow<'static, str>>, value: f64) -> Self

Create a fixed parameter.

pub fn clamp(&mut self)

Clamp value to bounds.

Trait Implementations

impl Clone for FitParameter

fn clone(&self) -> FitParameter

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FitParameter

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

Formats the value using the given formatter.