[Numpy-discussion] index of the first element fulfilling a condition?

Johann Bauer jbauer-news@web...
Wed Aug 18 13:07:48 CDT 2010


Hi,

is there a good method to find the index of the first element in a 1D 
array fulfilling a condition?

The following does the job

>>> import numpy
>>> a = numpy.array([1,5,78,3,12,4])
>>> numpy.where( a>10 )[0][0]
2

but it first compares the entire array and then selects the first index. 
Is there a way (especially for big arrays) to stop the comparison after 
the first hit?

Thanks for any help, Johann


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