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These notes are issues that were encountered in switching Cogent from Numeric to Numpy.
- When numpy returns a 1d array but Numeric returns a nd array, this is frequently due to a different default in axis. Resolved typically by setting axis=0.
- numpy.nonzero returns a tuple, Numeric.nonzero doesn't
- sum returns a numpy.scalar, not a standard float or int and the scalar has a length so code that relied on a try/except clause for len can fail.
- different error types can be set using numpy.seterr
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