Struct Trima 

pub struct Trima { /* private fields */ }

Triangular Moving Average — a simple moving average applied twice, which triangular-weights the window so the middle bars carry the most weight and the edges the least.

For period n the two stacked SMAs use lengths n1 and n2: an odd n uses n1 = n2 = (n + 1) / 2; an even n uses n1 = n / 2 and n2 = n / 2 + 1. Either way the first output lands after exactly n inputs.

Example

use wickra_core::{Indicator, Trima};

let mut indicator = Trima::new(5).unwrap();
let mut last = None;
for i in 0..80 {
    last = indicator.update(100.0 + f64::from(i));
}
assert!(last.is_some());

Implementations

impl Trima

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

Construct a new TRIMA with the given period.

Errors

Returns Error::PeriodZero if period == 0.

pub const fn period(&self) -> usize

Configured period.

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

Current value if available.

Trait Implementations

impl Clone for Trima

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 Trima

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

Formats the value using the given formatter.

impl Indicator for Trima

fn batch_fast_into(&mut self, inputs: &[f64], out: &mut [f64])

SIMD kernel: the inner and outer SMAs as the rolling-sum prefix-scan kernel. Agrees with the exact batch to within a few units in the last place; warmup NaNs and length are identical. TRIMA only remembers its last inner + outer − 1 inputs, so afterwards its state is rebuilt exactly by replaying them.

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 there is no value for this input.

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.

fn batch_nan_into(&mut self, inputs: &[Self::Input], out: &mut [f64])

where Self::Input: Copy, Self::Output: Into<f64>,

Run the indicator over inputs, writing one output per input into the caller-owned out buffer (NaN where update returns None). It exists for every indicator whose output converts to an f64; the batch pipelines use it for the scalar f64 -> f64 ones.