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https://github.com/mihakralj/QuanTAlib.git
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Miha Kralj
35a6702b06
Deep review of all indicator categories verified .md headers against .cs WarmupPeriod, parameters, inputs, and outputs. Fixes include warmup corrections, parameter documentation, output type accuracy, and Pine Script alignment.
31 lines
1.2 KiB
Plaintext
31 lines
1.2 KiB
Plaintext
// Licensed under the Apache License, Version 2.0
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// © mihakralj
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//@version=6
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indicator("Percentage Change (CHANGE)", "CHANGE", overlay=false, format=format.percent)
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//@function Calculates the percentage change of a source series over a specified length using the history referencing operator for efficiency.
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//@param source The source series (e.g. close price).
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//@param length The lookback period (number of bars). Must be > 0.
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//@returns float The percentage change over the specified length. Returns `na` if the historical value is `na` or zero.
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//@optimized Uses direct history access `source[length]` instead of array manipulation.
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change(float source, int length) =>
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if length <= 0
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runtime.error("Length must be greater than 0")
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float oldValue = source[length]
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if na(oldValue) or oldValue == 0
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na
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else
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(source / oldValue - 1) // Already a percentage, Pine handles plotting format
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// ---------- Main loop ----------
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// Inputs
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i_source = input.source(close, "Source")
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i_length = input.int(1, "Length", minval = 1)
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// Calculation
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result = change(i_source, i_length)
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// Plot
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plot(result, "Change %", color=color.yellow, linewidth=2)
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