The general idea is that on a dynamic scale (your chart x,y axis) there is no relative way to measure angles, as it depends on the height and width of your chart window, and the minimum and maximum prices displayed within the visible area. In short, measuring angles or slopes is not possible in this context.
I hope you can confirm I am correct, as that is just my interpretation and understanding. Please edit the article if I am wrong.
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The point is that an angle on a price chart has always represented price change or momentum. If alpha is the angle than we all know that tan (alpha) = price change / time interval. Angles can be compared if both the price scale and the scale of the time axis are invariant, as was the case with printed charts. Modern software allows you to compress the time axis, or even uses a non-linear time axis, as is the case for tick, volume, range and Renko charts when used with equidistant bar spacing. Moreover, if the price axis can be set to Autoscale, a growing or declining momentum maybe visually compensated by the charting software, which in turn makes the concept of angles obsolete for describing price action.
I think what people are saying if there is a "small angle", the the movement in neutral. I think that might help the illustration of Angle being bad as it means nothing (a fixed reference only for this one case maybe). What the trader is trying to determine is "Is this movement meaningful". Your concept of "neutral zone" in my mind is "this movement is meaningless".
I think it fits in this Wiki, but don't know if we should start a different one? Seems connected in concept to many things not just Angle, but when I first started thinking angle, I wanted to know if there was significant movement.
This discussion area is for the Wiki posting. Would you mind starting a thread on the forums for this posting? You may want to search as I think there are several "Angle/Slope" discussions or start a new one around Momentum & Volitility.