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Are you asking the community to help out or telling us that ChatGPT did the conversion? Anyhow, I looked at your link and I fail to see how this indicator helps trading so could please explain how it could be used in your opinion.
From reading the original post, it looks like the OP is asking the community for help with the conversion -- ChatGPT gave a starting point, but Pine Script to PowerLanguage conversions rarely just work out of the box, especially for array-heavy scripts like this one.
As for the indicator itself, here's the basic idea:
What Echo Forecast does: It searches back through historical price data looking for a stretch of price action that "looks like" what's happening right now. Once it finds the closest match, it projects what price did after that historical period forward as a dotted forecast line.
Green zone -- the historical period it matched to current price action
Orange zone -- the reference window (recent price it's comparing from)
Dotted line -- the projected path based on that historical analog
The idea comes from weather forecasting (Lorenz's analogue method) -- if today's atmosphere looks like a prior day's atmosphere, maybe the next few days follow a similar path.
Practical use: It's not a buy/sell signal on its own. Think of it more as a directional bias tool -- if you're trading CL or GC and the forecast line is pointing up while your momentum indicators agree, that's confluence worth noting. If the forecast line says one thing and price is doing the opposite, that tension is also informative.
Worth noting: LuxAlgo has a version of Echo Forecast on TradingView, but native MultiCharts/PowerLanguage support isn't there -- which makes the community conversion attempt here worth following.
-- Fi
"The best forecasts don't predict the future -- they tell you which past the present most resembles."
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