Struct CenterOfGravity 

pub struct CenterOfGravity { /* private fields */ }

Ehlers’ Center of Gravity (CG) oscillator.

Treats the most recent period prices as masses and reports the weighted “center” of that mass distribution, negated so positive readings correspond to recent strength:

num = sum_{k=0..period-1} (1 + k) * price[t - k]
den = sum_{k=0..period-1} price[t - k]
cg  = - num / den + (period + 1) / 2

The constant offset centres the oscillator around zero. From Ehlers, Cybernetic Analysis for Stocks and Futures (2004, ch. 7).

Example

use wickra_core::{Indicator, CenterOfGravity};

let mut cg = CenterOfGravity::new(10).unwrap();
let mut last = None;
for i in 0..30 {
    last = cg.update(100.0 + (f64::from(i) * 0.2).sin() * 5.0);
}
assert!(last.is_some());

Implementations

impl CenterOfGravity

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

Construct with the rolling window length.

Errors

Returns Error::PeriodZero if period == 0.

pub const fn period(&self) -> usize

Configured period.

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

Current value if available.

Trait Implementations

impl Clone for CenterOfGravity

fn clone(&self) -> CenterOfGravity

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CenterOfGravity

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

Formats the value using the given formatter.

impl Indicator for CenterOfGravity

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.