EMA 20-50-100-200 - Indie Port Guide

Four exponential moving averages of the close with fixed lengths 20, 50, 100 and 200.

Overview

Plots four EMAs of the closing price on the chart: 20, 50, 100 and 200 bars. The lengths are fixed in the original script, so there are no inputs.

Typical use is reading trend and pullbacks against several time horizons at once: price above the whole stack is a strong uptrend, the order of the lines shows how mature the trend is.

How it works

1. For each length n in (20, 50, 100, 200) compute ema(close, n).
2. Plot the four lines (red, orange, aqua, blue in the original).

Port notes

Differences and decisions in the Indie port (taken from the header of EMA 20-50-100-200.indie5):

• Four EMAs of close, lengths fixed as in the original (no inputs)

Verification

The four lines were compared with the original script on the same candles: BTC 30-minute candles exported from TradingView (2,473 bars, 15 Aug - 5 Oct 2026). EMA 20 and EMA 50 matched to about 1e-14 of the price range, EMA 100 to 3e-10, EMA 200 to 2e-5. The EMA 200 residual is the unavoidable start-up difference: an EMA of that length does not fully forget its first value within about a thousand bars, and TradingView starts from an earlier bar.

Full source code

Indie Script v5. Copy it into the platform’s script editor. The original Pine Script is published next to it as EMA 20-50-100-200.pinescript.

# indie:lang_version = 5
# EMA 20/50/100/200 — Indie port
# Original Pine Script by drsweets (open_no_auth)
# Migration notes:
#   Four EMAs of close, lengths fixed as in the original (no inputs)

from indie import indicator, plot, MainContext, color
from indie.algorithms import Ema

@indicator('EMA 20/50/100/200', overlay_main_pane=True)
@plot.line('ema20',  color=color.rgba(255, 0, 0,   1.0), line_width=1, title='EMA 20')
@plot.line('ema50',  color=color.rgba(255, 152, 0, 1.0), line_width=1, title='EMA 50')
@plot.line('ema100', color=color.rgba(0, 188, 212, 1.0), line_width=1, title='EMA 100')
@plot.line('ema200', color=color.rgba(33, 150, 243, 1.0), line_width=1, title='EMA 200')
class Main(MainContext):
    def calc(self):
        return (
            plot.Line(Ema.new(self.close, 20)[0]),
            plot.Line(Ema.new(self.close, 50)[0]),
            plot.Line(Ema.new(self.close, 100)[0]),
            plot.Line(Ema.new(self.close, 200)[0]),
        )