Struct Ema 

pub struct Ema { /* private fields */ }

Exponential Moving Average with smoothing factor alpha = 2 / (period + 1).

The first value is the simple mean of the first period inputs (the TA-Lib convention); each subsequent input contributes alpha * input + (1 - alpha) * previous, computed with the same fused multiply-add and precomputed 1 - alpha as wickra_core::Ema, so the steady-state output is bit-for-bit identical.

The period is a runtime value: EMA needs no window buffer (only a running warmup sum), so it stays allocation-free without a const generic.

Example

use wickra_embed_core::{Ema, Indicator};

let mut ema = Ema::new(3);
let mut last = None;
for i in 0..10 {
    last = ema.update(100.0 + f64::from(i));
}
assert!(last.is_some());

Implementations

impl Ema

pub fn new(period: usize) -> Self

Construct an EMA with the given period. A period of 0 yields an alpha of 2.0 and never produces a meaningful value; callers pass a positive period (the bindings validate up front).

pub const fn period(&self) -> usize

Configured period.

pub const fn alpha(&self) -> f64

Smoothing factor alpha.

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

Current value if seeded.

Trait Implementations

impl Clone for Ema

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Ema

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

Formats the value using the given formatter.

impl Indicator for Ema

type Input = f64

Type of one input data point (f64 for a price, Candle for an OHLC bar).

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

Feed one new data point in and return the freshly computed value, or None while 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.

fn is_ready(&self) -> bool

Whether the indicator has produced at least one value since construction or the last reset.

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

Stable, human-readable indicator name.