Is it correct to add booleans in order to count the number of true values in a vector?
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gerrit
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Published on 2012-10-19T22:36:52Z
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Is it conceptually correct to sum a vector of booleans? From a mathematical point of view, I would argue it's not: True + True != 2. But it's quite practical to do so still! Example using the vectorised Python library numpy:
In [1]: X = rand(10)
In [2]: large = X>0.6
In [3]: large.dtype
Out[3]: dtype('bool')
In [4]: large.sum()
Out[4]: 7
I don't like it, but it's very practical. Is this a good practice?
Update: the aim is to count the number of true values in a vector.
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