On Fri, Dec 6, 2013 at 11:13 AM, Alan G Isaac <alan.is...@gmail.com> wrote:
> On 12/5/2013 11:14 PM, Alexander Belopolsky wrote: > > did you find minus to be as useful? > > > It is also a correct usage. > > Can you provide a reference? > I think a good approach to this is to first realize that > there were good reasons for the current behavior. > > Maybe there were, in which case the current behavior should be documented somewhere. What is the rationale for this: >>> -array(True) + array(True) True ? I am not aware of any algebraic system where unary minus denotes anything other than additive inverse. Having bools form a semiring under + and * is a fine (yet somewhat unusual) choice, but once you've made that choice you loose subtraction because True + x = True no longer has a unique solution.
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