Struct ElderImpulse 

pub struct ElderImpulse { /* private fields */ }

Alexander Elder’s Impulse System — a tri-state momentum gauge combining the slope of an EMA trend filter with the slope of the MACD histogram.

On each bar Wickra reports:

• +1 (“green / buy”) when both the EMA trend and the MACD histogram are rising bar-over-bar.
• −1 (“red / sell”) when both are falling.
• 0 (“blue / neutral”) when the two disagree.

The defaults track Elder’s Come Into My Trading Room parameterisation: EMA(13) for the trend, MACD(12, 26, 9) for the histogram.

Example

use wickra_core::{ElderImpulse, Indicator};

let mut elder = ElderImpulse::classic();
let mut last = None;
for i in 0..120 {
    last = elder.update(100.0 + f64::from(i));
}
assert!(last.is_some());

Implementations

impl ElderImpulse

pub fn new( ema_period: usize, macd_fast: usize, macd_slow: usize, macd_signal: usize, ) -> Result<Self>

Errors

Forwarded from Ema::new / MacdIndicator::new.

pub fn classic() -> Self

Elder’s recommended defaults (ema_period = 13, macd = 12/26/9).

pub const fn periods(&self) -> (usize, usize, usize, usize)

Configured (ema_period, macd_fast, macd_slow, macd_signal).

Trait Implementations

impl Clone for ElderImpulse

fn clone(&self) -> ElderImpulse

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ElderImpulse

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

Formats the value using the given formatter.

impl Indicator for ElderImpulse

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.