Struct EmaState 

pub struct EmaState { /* private fields */ }

Incremental EMA (α = 2/(period+1), seed = SMA of first period closes).

Batch ema uses this state end-to-end.

Examples

use finance_solution::stocks::ta::{EmaState, ema};
let closes: Vec<f64> = (1..=20).map(|x| x as f64).collect();
let batch = ema(&closes, 5).unwrap();
let mut st = EmaState::new(5).unwrap();
let mut last = None;
for &c in &closes {
    last = st.push(c).unwrap();
}
assert!((last.unwrap() - batch[19].unwrap()).abs() < 1e-9);

Implementations

impl EmaState

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

pub fn from_history(period: usize, closes: &[f64]) -> FinanceResult<Self>

pub fn period(&self) -> usize

pub fn reset(&mut self)

pub fn push(&mut self, close: f64) -> FinanceResult<Option<f64>>

pub fn push_bars(&mut self, closes: &[f64]) -> FinanceResult<Vec<Option<f64>>>

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

Trait Implementations

impl Clone for EmaState

fn clone(&self) -> EmaState

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for EmaState

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

Formats the value using the given formatter.