[SciPy-user] indices of consecutive elements
Daniel Ashbrook
anjiro@cc.gatech....
Tue Dec 2 10:43:34 CST 2008
I'm trying to figure out a way to return the indices of the start and
end of a run of consecutive elements that match some condition, but only
if there are more than a certain number.
For example, take the array (with indices in comment for clarity):
#0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
[0, 0, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0]
I want to find the start and end indices of all runs of 1s with length
of 4 or longer; so here the answer would be:
[[2,5], [15,18]]
Is there a reasonable way to do this without looping? I've been playing
around with diff() and where() but without too much progress.
Thanks,
dan
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