Struct Roc 

pub struct Roc<const N: usize> { /* private fields */ }

Rate of Change as a percentage: (close - close[N ago]) / close[N ago] · 100, where N is the lookback period.

A ring of exactly N slots holds the last N values; the slot about to be overwritten is the value from N steps ago, so no N + 1 buffer is needed. Non-finite inputs are ignored (the last value is returned, state untouched), matching wickra_core::Roc. The first output appears after N + 1 inputs.

Example

use wickra_embed_core::{Indicator, Roc};

// ROC(3): prev = 100 three steps back, now = 110 -> 10%.
let mut roc = Roc::<3>::new();
assert_eq!(roc.update(100.0), None);
assert_eq!(roc.update(105.0), None);
assert_eq!(roc.update(108.0), None);
assert_eq!(roc.update(110.0), Some(10.0));

Implementations

impl<const N: usize> Roc<N>

pub const fn new() -> Self

Construct a new ROC over a lookback of N.

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

Current value if available.

Trait Implementations

impl<const N: usize> Clone for Roc<N>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<const N: usize> Debug for Roc<N>

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

Formats the value using the given formatter.

impl<const N: usize> Default for Roc<N>

fn default() -> Self

Returns the “default value” for a type.

impl<const N: usize> Indicator for Roc<N>

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.