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A comment on Show HN: Robot that copies artist's exact strokes to replicate a painting in 3D. Parent comment

Re:Show HN: Robot that copies artist's exact strokes to repl... by LukeShu on Monday August 24, 2015 @06:17PM (#10113217)
The first time you wrote "PDI", I assumed it was a typo for "PID", but you kept writing it. I'm curious, what's your background that you know it as "PDI"?
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Re:Show HN: Robot that copies artist's exact strokes to repl... by chucksmash on Wednesday August 26, 2015 @07:13AM (#10122173)
"The usual solution is a proportional-integral-differential (PDI) controller driven by position measurements."
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