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Old 3rd December 2015, 09:23 AM   #344
Dave Rogers
Bandaged ice that stampedes inexpensively through a scribbled morning waving necessary ankles
 
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Join Date: Jan 2007
Location: Cair Paravel, according to XKCD
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Originally Posted by Gamolon View Post
In regards to my post above, why does Tony choose the average of the plotted points as shown here...
...but chooses to ignore the individual points in the graph showing deceleration here with the red lines?
The regions you're talking about don't show deceleration; they show acceleration, but less than the steeper sections. And, to be fair, the fact that they're all about the same slope suggests to me that this is a mix of noise and discretisation error. If Chandler's counting pixels, his approach may only measure velocity in steps, in which case you'd expect some variation if the velocity change isn't an exact number of steps for each point. But it's certainly a stretch, to put it mildly, to say that this graph shows constant acceleration from the moment of collapse initiation; it obviously doesn't.

Dave
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