On Sat, May 24, 2008 at 7:47 PM, Robert Kern <[EMAIL PROTECTED]> wrote:
> On Sat, May 24, 2008 at 8:31 PM, Charles R Harris > <[EMAIL PROTECTED]> wrote: > > Hi All, > > > > I'm writing tests for ufuncs and turned up some oddities: > > > > In [4]: degrees(True) > > Out[4]: 57.29578 > > > > In [5]: radians(True) > > Out[5]: 0.017453292 > > > > In [6]: sin(True) > > Out[6]: 0.84147096 > > > > Do we want numeric functions to apply to booleans? > > I don't see a good reason to prevent it. They are just 0 and 1 under > the covers and behave like it everywhere else (e.g. True + True == 2 > and the very useful boolean_mask.sum()). > True + True == 1 In [5]: x + x Out[5]: array([ True, True], dtype=bool) In [6]: (x + x).astype(int) Out[6]: array([1, 1]) That is how the inner loop is implemented. Chuck
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