Struct Fama 

pub struct Fama { /* private fields */ }

Scalar wrapper that exposes only the FAMA line from a Mama indicator.

FAMA (Following Adaptive Moving Average) is MAMA’s lagging companion in Ehlers’ MESA construction. It uses half MAMA’s adaptive alpha, so it reacts later than MAMA — MAMA crossing above FAMA marks a trend confirmation, MAMA below FAMA a reversal. See Mama for the joint (mama, fama) output; this wrapper exposes the slow line as a plain scalar indicator so it can be chained directly.

Example

use wickra_core::{Indicator, Fama};

let mut fama = Fama::new(0.5, 0.05).unwrap();
let mut last = None;
for i in 0..80 {
    last = fama.update(100.0 + (f64::from(i) * 0.3).sin() * 5.0);
}
assert!(last.is_some());

Implementations

impl Fama

pub fn new(fast_limit: f64, slow_limit: f64) -> Result<Self>

Construct with the same (fast_limit, slow_limit) semantics as Mama.

Errors

Forwards Mama::new’s validation errors.

pub fn classic() -> Self

Default (0.5, 0.05) parameters.

pub const fn limits(&self) -> (f64, f64)

Configured (fast_limit, slow_limit).

pub const fn value(&self) -> Option<f64>

Current FAMA value if available.

Trait Implementations

impl Clone for Fama

fn clone(&self) -> Fama

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Fama

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

Formats the value using the given formatter.

impl Indicator for Fama

type Input = f64

Type of one input data point (typically f64 for a price, or Candle / Tick).

type Output = f64

Type of one output value.

fn update(&mut self, input: f64) -> Option<f64>

Feed one new data point into the indicator and return the freshly computed output, or None if the indicator is still warming up.

fn reset(&mut self)

Reset all internal state, leaving the indicator equivalent to a freshly constructed instance with the same parameters.

fn warmup_period(&self) -> usize

Number of inputs required before the first non-None output can be produced.

fn is_ready(&self) -> bool

Whether the indicator has emitted at least one value since the last reset.

fn name(&self) -> &'static str

Stable, human-readable indicator name. Used by chaining and diagnostics.