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31 lines
1.1 KiB
Plaintext
31 lines
1.1 KiB
Plaintext
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// The MIT License (MIT)
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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.blue, color=color.yellow, linewidth=2)
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