@Carl: the solutions already work this way, in this example the distance between "the points half-way between y(1) and y(2), and between y(5) and y(6)" is 5.5-1.5 (i.e. four, not five)
Ahh, yes. Sorry, my bad
This fails, I believe, for asymmetric peaks. Try y = [0:4 , 3:-1:1,1,1,1,1,1]
Hey Albert, there is abs() missing in the test suite.
Thanks, Jan. I just fixed it.
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