Struct FryPanBottom 

pub struct FryPanBottom { /* private fields */ }

Frying Pan Bottom — a gently rounded bottom across the lookback window: prices decline, flatten near the centre, then recover above where they started.

over the last `period` closes:
  the minimum close sits in the middle third of the window (the "bowl")
  the latest close is above the first close (the rim is recovered)
signal = +1 when both hold, else 0

The frying pan is a bullish accumulation pattern: a saucer-shaped base where selling dries up, the curve flattens, and price lifts off the rim. Detecting it requires the low point to be central (a symmetric bowl, not a one-sided drop) and the close to have climbed back above the window’s opening level, confirming the breakout from the base. The output is +1.0 (pattern) or 0.0.

The first value lands after period inputs; each update scans the window in O(period).

Example

use wickra_core::{Candle, Indicator, FryPanBottom};

let mut indicator = FryPanBottom::new(9).unwrap();
// A U-shaped base then recovery.
let closes = [100.0, 98.0, 96.0, 95.0, 96.0, 98.0, 101.0, 103.0, 105.0];
let mut last = None;
for &cl in &closes {
    let c = Candle::new(cl, cl + 0.5, cl - 0.5, cl, 1_000.0, 0).unwrap();
    last = indicator.update(c);
}
assert_eq!(last, Some(1.0));

Implementations

impl FryPanBottom

pub fn new(period: usize) -> Result<FryPanBottom, Error>

Construct a Frying Pan Bottom over period bars.

Errors

Returns Error::InvalidPeriod if period < 5 (a bowl needs room for a central low between recovering sides).

pub const fn period(&self) -> usize

Configured window period.

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

Current value if available.

Trait Implementations

impl Clone for FryPanBottom

fn clone(&self) -> FryPanBottom

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FryPanBottom

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

Formats the value using the given formatter.

impl Indicator for FryPanBottom

type Input = Candle

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, candle: Candle) -> 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.