feat: add new indicators (Decay, Edecay, MinusDi, MinusDm, PlusDi, PlusDm, Maxindex, Minindex, Sarext) and update pine scripts, core libs, validation tests, and python bindings
2026-03-09 13:45:46 -07:00
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// Licensed under the Apache License, Version 2.0
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2026-01-18 19:02:03 -08:00
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// © mihakralj
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//@version=6
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indicator("Ulcer Index (UI)", shorttitle="UI", format=format.price, precision=2, overlay=false)
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//@function Calculates the Ulcer Index (UI).
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//@param src The source series. Default is `close`.
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//@param period The lookback period. Default is 14.
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//@returns float The Ulcer Index value.
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ui(series float src, int period) =>
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var deque = array.new_int(0)
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var src_buffer = array.new_float(period, na)
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var int current_index = 0
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float current_val = nz(src)
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array.set(src_buffer, current_index, current_val)
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while array.size(deque) > 0 and array.get(deque, 0) <= bar_index - period
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array.shift(deque)
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while array.size(deque) > 0
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int last_index_in_deque = array.get(deque, array.size(deque) - 1)
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int buffer_lookup_index = last_index_in_deque % period
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if array.get(src_buffer, buffer_lookup_index) <= current_val
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array.pop(deque)
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else
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break
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array.push(deque, bar_index)
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int highest_index = array.get(deque, 0)
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int highest_buffer_index = highest_index % period
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highestClose = array.get(src_buffer, highest_buffer_index)
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current_index := (current_index + 1) % period
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percentDrawdown = ((src - highestClose) / highestClose) * 100.0
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squaredDrawdown = math.pow(percentDrawdown, 2)
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sumSquaredDrawdown = math.sum(squaredDrawdown, period)
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averageSquaredDrawdown = sumSquaredDrawdown / period
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ui = math.sqrt(averageSquaredDrawdown)
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ui
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// Inputs
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i_src_ui = input.source(close, "Source")
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i_period_ui = input.int(14, "Period", minval=1, tooltip="Lookback period for calculating the Ulcer Index.")
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// Calculation
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uiValue = ui(i_src_ui, i_period_ui)
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// Plot
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plot(uiValue, "UI", color=color.yellow, linewidth=2)
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