293 lines
9.6 KiB
Go
293 lines
9.6 KiB
Go
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package talib
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// AD - Chaikin Accumulation/Distribution Line, a cumulative volume-flow indicator.
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// Sums a volume-weighted money-flow multiplier per bar to gauge buying vs. selling pressure.
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// Rising line = accumulation (buying pressure); falling = distribution.
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//
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// MFM = ((close-low) - (high-close)) / (high-low);
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// AD_t = AD_{t-1} + MFM_t * volume_t (running sum, seeded at 0)
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func AD(inHigh, inLow, inClose, inVolume []float64) []float64 {
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var (
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startIdx int32
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endIdx = int32(len(inClose) - 1)
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outBegIdx int32
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outNBElement int32
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outReal = make([]float64, len(inClose))
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)
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if retCode := ad(
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startIdx,
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endIdx,
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inHigh,
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inLow,
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inClose,
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inVolume,
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&outBegIdx,
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&outNBElement,
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outReal,
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); retCode != 0 {
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return nil
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}
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return outReal
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}
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// ADOsc - Chaikin A/D Oscillator: the difference between a fast and a slow EMA of the Accumulation/Distribution line.
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// Highlights momentum in accumulation/distribution volume flow.
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// Positive/rising suggests accumulation; negative/falling suggests distribution.
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//
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// ad += ((close-low)-(high-close))/(high-low) * volume (only when high>low)
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// fastEMA = fastk*ad + (1-fastk)fastEMA, fastk = 2/(optInFastPeriod+1)
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// slowEMA = slowkad + (1-slowk)*slowEMA, slowk = 2/(optInSlowPeriod+1)
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// ADOSC = fastEMA - slowEMA
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//
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// @param inHigh []float64
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// @param inLow []float64
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// @param inClose []float64
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// @param inVolume []float64
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// @param fastPeriod int Period of the fast A/D EMA; default is 3 (2–100000)
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// @param slowPeriod int Period of the slow A/D EMA; default is 10 (2–100000)
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// @return []float64 Fast-EMA minus slow-EMA of the A/D line
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func ADOsc(inHigh, inLow, inClose, inVolume []float64, fastPeriod, slowPeriod int) []float64 {
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var (
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startIdx int32
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endIdx = int32(len(inClose) - 1)
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outBegIdx int32
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outNBElement int32
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outReal = make([]float64, len(inClose))
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)
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if retCode := adosc(
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startIdx,
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endIdx,
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inHigh,
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inLow,
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inClose,
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inVolume,
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int32(fastPeriod),
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int32(slowPeriod),
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&outBegIdx,
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&outNBElement,
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outReal,
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); retCode != 0 {
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return nil
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}
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return outReal
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}
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// CMF - Chaikin Money Flow: over a trailing window of optInTimePeriod bars, the sum of each bar's money flow volume divided by the sum of its volume.
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// The result is a ratio in [-1, +1].
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// A bar's money flow volume is its volume scaled by where the close sat inside the bar's range: a close at the high contributes the full volume,
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// a close at the low contributes minus the full volume, and a close at the midpoint contributes nothing.
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// Summing that over a window and dividing by the window's volume answers "over these N bars, what share of the traded volume closed near the top of its range?"
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//
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// Above zero is accumulation, below zero is distribution, and the distance from zero measures conviction.
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// Because the divisor is the window's own volume, the output is comparable across instruments and across time in a way a raw accumulation total is not.
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//
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// Created by Marc Chaikin, who also authored the AD line this shares its per-bar multiplier with.
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// CMF is that same multiplier summed over a fixed window and normalised, where AD accumulates it from the start of the series without bound.
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//
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// t = high[i] - low[i]
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// mfv[i] = ((close[i] - low[i]) - (high[i] - close[i])) / t * volume[i], or 0 when t is not positive
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// CMF[i] = ( sum_{k=i-N+1..i} mfv[k] ) / ( sum_{k=i-N+1..i} volume[k] ), N = optInTimePeriod
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// There is no seeding and no recursion, hence no unstable period. Each output depends only on the N bars in its own window.
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//
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// Note: The output is the raw ratio in [-1, +1], matching every published definition.
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// Some retail platforms display it multiplied by 100; that is a presentation choice, not a different indicator.
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//
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// Each bar's close is expected to lie within its own [low, high], and its volume to be finite and non-negative.
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// A close outside its bar makes the multiplier exceed ±1 and is passed through unclamped, exactly as AD does.
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//
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// A bar whose high equals its low has no range for the close to sit inside, so it contributes exactly zero money flow volume rather than dividing by zero.
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// Its volume still counts toward the divisor.
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//
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// A window whose volume is entirely zero has no money flow to distribute and reports 0.0.
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// Published references are silent here and other implementations divide by zero; TA-Lib does not return NaN from a successful call.
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//
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// Bars where the low exceeds the high are malformed rather than degenerate, and also contribute zero.
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// The default period of 20 follows the original write-up, which describes 20 or 21 bars.
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//
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// @param inHigh []float64
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// @param inLow []float64
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// @param inClose []float64
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// @param inVolume []float64
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// @param period int Lookback window; default is 20 (2–100000)
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// @return []float64
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//
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// since TA-Lib 0.8.1
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func CMF(inHigh, inLow, inClose, inVolume []float64, period int) []float64 {
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var (
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startIdx int32
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endIdx = int32(len(inClose) - 1)
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outBegIdx int32
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outNBElement int32
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outReal = make([]float64, len(inClose))
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)
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if retCode := cmf(
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startIdx,
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endIdx,
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inHigh,
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inLow,
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inClose,
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inVolume,
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int32(period),
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&outBegIdx,
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&outNBElement,
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outReal,
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); retCode != 0 {
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return nil
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}
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return outReal
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}
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// NVI - Negative Volume Index: a running cumulative index that changes only on days when
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// volume falls versus the prior day, compounding that day's percentage price change.
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// The premise is that quiet, low-volume days reflect the actions of well-informed
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// "smart money", so NVI is read as a proxy for that cohort's positioning.
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//
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// NVI[startIdx] = 1000
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//
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// For each subsequent bar i:
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// NVI[i] = NVI[i-1] + ( inVolume[i] < inVolume[i-1] ? ((inClose[i] - inClose[i-1]) / inClose[i-1]) * NVI[i-1] : 0 )
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//
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// The index carries forward unchanged on bars whose volume did not fall (and on the
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// degenerate case of a zero previous close, which would otherwise divide by zero).
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//
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// since TA-Lib 0.8.1
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func NVI(inReal, inVolume []float64) []float64 {
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var (
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startIdx int32
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endIdx = int32(len(inReal) - 1)
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outBegIdx int32
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outNBElement int32
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outReal = make([]float64, len(inReal))
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)
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if retCode := nvi(
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startIdx,
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endIdx,
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inReal,
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inVolume,
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&outBegIdx,
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&outNBElement,
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outReal,
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); retCode != 0 {
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return nil
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}
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return outReal
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}
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// OBV - On Balance Volume: a running cumulative total of volume, added on up-price bars and subtracted on down-price bars.
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// Relates volume flow to price direction.
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func OBV(inReal, inVolume []float64) []float64 {
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var (
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startIdx int32
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endIdx = int32(len(inReal) - 1)
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outBegIdx int32
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outNBElement int32
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outReal = make([]float64, len(inReal))
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)
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if retCode := obv(
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startIdx,
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endIdx,
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inReal,
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inVolume,
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&outBegIdx,
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&outNBElement,
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outReal,
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); retCode != 0 {
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return nil
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}
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return outReal
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}
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// PVI - Positive Volume Index: a running cumulative index that changes only on days when
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// volume rises versus the prior day, compounding that day's percentage price change.
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// The premise is that active, high-volume days reflect the actions of the
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// less-informed "crowd", so PVI is read as a proxy for that cohort's positioning.
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//
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// PVI[startIdx] = 1000
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//
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// For each subsequent bar i:
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// PVI[i] = PVI[i-1] + ( inVolume[i] > inVolume[i-1] ? ((inClose[i] - inClose[i-1]) / inClose[i-1]) * PVI[i-1] : 0 )
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//
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// The index carries forward unchanged on bars whose volume did not rise (and on the
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// degenerate case of a zero previous close, which would otherwise divide by zero).
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//
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// since TA-Lib 0.8.1
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func PVI(inReal, inVolume []float64) []float64 {
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var (
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startIdx int32
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endIdx = int32(len(inReal) - 1)
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outBegIdx int32
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outNBElement int32
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outReal = make([]float64, len(inReal))
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)
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if retCode := pvi(
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startIdx,
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endIdx,
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inReal,
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inVolume,
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&outBegIdx,
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&outNBElement,
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outReal,
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); retCode != 0 {
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return nil
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}
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return outReal
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}
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// PVO - Percentage Volume Oscillator: a variation of the Percentage Price Oscillator (PPO, created by Gerald Appel)
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// applied to the volume series instead of price. It is the difference between a fast and slow moving average of volume,
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// expressed as a percentage of the slow talib.MAType.
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// Positive when short-term volume is above its longer-term average (rising participation), negative when below.
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// The default periods (12, 26) match MACD and PPO.
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//
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// PVO = ((fastMA(inVolume) - slowMA(inVolume)) / slowMA(inVolume)) * 100, both MAs of type optInMAType; output = 0 when slowMA == 0
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//
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// The standard form is exponential with periods 12 and 26 — ((12-day EMA of Volume - 26-day EMA of Volume) / 26-day EMA of Volume) * 100,
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// i.e. the talib.PPO/talib.MACD oscillator computed on volume.
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// optInMAType therefore defaults to talib.EMA — the moving average Gerald Appel used for the original talib.PPO/talib.MACD;
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// pass another type (e.g. talib.MA_SMA) to override.
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//
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// @param inVolume []float64
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// @param fastPeriod int Period of the fast moving average; default is 12 (2–100000)
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// @param slowPeriod int Period of the slow moving average; default is 26 (2–100000)
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// @param ma MAType Type of moving average to use; default is talib.EMA
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// @return []float64 Percentage Volume Oscillator
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//
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// since TA-Lib 0.8.1
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func PVO(inVolume []float64, fastPeriod, slowPeriod int, ma MAType) []float64 {
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var (
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startIdx int32
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endIdx = int32(len(inVolume) - 1)
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outBegIdx int32
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outNBElement int32
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outReal = make([]float64, len(inVolume))
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)
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if retCode := pvo(
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startIdx,
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endIdx,
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inVolume,
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int32(fastPeriod),
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int32(slowPeriod),
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int32(ma),
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&outBegIdx,
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&outNBElement,
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outReal,
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); retCode != 0 {
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return nil
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}
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return outReal
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}
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