Struct TdDWave 

pub struct TdDWave { /* private fields */ }

Tom DeMark TD D-Wave — a streaming wave counter that labels the market’s swing sequence with an Elliott-style 1–5 impulse / A–C correction count.

TD D-Wave is DeMark’s objective alternative to discretionary Elliott Wave counting. This streaming implementation detects alternating swing pivots with a symmetric fractal of half-width strength, and advances a counter through the eight-leg cycle each time a new swing leg is confirmed:

legs:  1 → 2 → 3 → 4 → 5 → A(6) → B(7) → C(8) → 1 …
output = current wave number, 1.0..8.0   (6/7/8 = corrective A/B/C)

The number tells you which wave of the cycle price is currently working on — a running map of impulse versus correction that updates as each swing confirms. This is a simplified swing-leg count (it does not enforce Elliott’s price ratio and overlap rules); treat it as a structural guide, not a strict wave label.

Readiness is data-dependent: the first value appears once the first swing pivot confirms (strength bars after it forms). warmup_period returns the minimum bars to confirm one pivot. Each update is O(strength).

Example

use wickra_core::{Candle, Indicator, TdDWave};

let mut indicator = TdDWave::new(2).unwrap();
let mut last = None;
for i in 0..120 {
    let base = 100.0 + (f64::from(i) * 0.5).sin() * 10.0;
    let c = Candle::new(base, base + 1.0, base - 1.0, base, 1_000.0, 0).unwrap();
    last = indicator.update(c);
}
let _ = last;

Implementations

impl TdDWave

pub fn new(strength: usize) -> Result<Self>

Construct a TD D-Wave with the given fractal strength.

Errors

Returns Error::PeriodZero if strength == 0.

pub const fn strength(&self) -> usize

Configured fractal strength.

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

Current wave number if available.

Trait Implementations

impl Clone for TdDWave

fn clone(&self) -> TdDWave

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TdDWave

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

Formats the value using the given formatter.

impl Indicator for TdDWave

type Input = Candle

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, candle: Candle) -> 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.