Identify groups of consecutive values within NumPy array

Question

I have a NumPy array of values, and I am needing to identify groups of consecutive values within the array.

I've tried writing a "for" loop to do this, but I'm running into a host of issues. So I've looked at the documentation for groupby in itertools. I've never used this before, and I'm more than a little confused by the documentation, so here I am.

Could someone give a more "layman speak" explanation of how to use groupby? I don't need a sample code, per se, just a more thorough explanation of the documentation.

See this question.

Ami Tavory
– Ami Tavory

2015-06-03 17:26:44 +00:00
Commented Jun 3, 2015 at 17:26 — Ami Tavory
– Ami Tavory, Commented Jun 3, 2015 at 17:26

Joran Beasley · Accepted Answer · 2015-06-03 17:35:15Z

1

a good answer to this is to use a generator to group it (might not be the fastest method)

def groupings(a):
     g = []
     for val in a:
         if not g:
             g.append(val)
         elif abs(g[-1] - val) <= 1.00001:
             g.append(val)
         else:
             yield g
             g = []

print list(groupings(my_numpy_array))

I know this doesnt give you a laymans explanation of group by (group consecutive items that match some criteria... it would be somewhat painful for this type of application)

answered Jun 3, 2015 at 17:35

Joran Beasley

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