Module rsi 

Relative Strength Index (RSI)

Wilder RSI on closes:

change[i] = close[i] − close[i−1]
avg_gain, avg_loss: Wilder smooth over `period` (first seed = SMA of gains/losses)
RS  = avg_gain / avg_loss
RSI = 100 − 100 / (1 + RS)

Default pack: period 14 (RsiParams::period_14).

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Trading perspective

Region	Habit (classic, not a rule)
RSI > 70	“Overbought” screen
RSI < 30	“Oversold” screen
Divergences	Price vs RSI direction stories

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Engineering perspective

Same TA layers: RsiParams → ValidatedRsi / rsi → RsiState → rsi_solution. Warm-up bars are None until the Wilder seed is ready (index period first possible).

Word problem

Fourteen closes are flat then one up-bar. Is RSI defined on the last bar of a 15-long series?

Yes after seed: first RSI appears at index period (needs period changes ⇒ period+1 closes).

use finance_solution::stocks::ta::{rsi, RsiParams};
let mut c: Vec<f64> = (0..15).map(|i| 100.0 + i as f64).collect();
let s = rsi(&c, RsiParams::period_14()).unwrap();
assert!(s.rsi[14].is_some());
assert!(s.rsi[13].is_none());

Structs

RsiParams

RSI lookback pack (Wilder).

RsiSeries

RsiSolution

RsiState

Incremental Wilder RSI.

ValidatedRsi

Validated RSI config.

Functions

rsi

rsi_solution

Examples