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[amibroker] rate of change/acceleration



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I am trying to find a way to find out whether, and how much, a chart 
has accelerted over the previous period. This is not ROC, but more 
true 'rate of change' in a differential calculus sense. 

IN other words - if diff between close today snd  close yesterday > 
close yesterday and the day before, then the close prices are 
ACCELERATING up over the last 3 days.

Can anyone think up a general way to code this?


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