Struct StdDev 

pub struct StdDev { /* private fields */ }

Standard Deviation indicator.

Measures price dispersion around the mean. Higher values indicate higher volatility.

Examples

use velora_ta::{StdDev, SingleIndicator};
use chrono::Utc;

let mut std_dev = StdDev::new(20).unwrap();
let timestamp = Utc::now();

for price in vec![100.0, 105.0, 95.0, 110.0, 90.0] {
    if let Some(value) = std_dev.update(price, timestamp).unwrap() {
        println!("StdDev: {:.2}", value);
    }
}

Implementations

impl StdDev

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

Creates a new Standard Deviation indicator.

Arguments

• period - Number of periods for calculation (must be > 1)

Errors

Returns an error if period is 0 or 1.

Trait Implementations

impl Clone for StdDev

fn clone(&self) -> StdDev

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for StdDev

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

Formats the value using the given formatter.

impl Indicator for StdDev

fn name(&self) -> &str

Human-readable name of the indicator.

fn warmup_period(&self) -> usize

Minimum number of data points required before the indicator produces valid output.

fn is_ready(&self) -> bool

Check if the indicator has received enough data to produce valid output.

fn reset(&mut self)

Reset the indicator to its initial state.

impl SingleIndicator for StdDev

fn update( &mut self, price: f64, _timestamp: DateTime<Utc>, ) -> IndicatorResult<Option<f64>>

Process a new data point and return the updated indicator value.

fn current(&self) -> Option<f64>

Get the current indicator value without updating.

fn calculate(&self, prices: &[f64]) -> IndicatorResult<Vec<Option<f64>>>

Calculate indicator values for historical data (batch mode).