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Re: [Scheme-reports] Strong win later reversed: Real numbers have imaginary part #e0
John Cowan <cowan@x> writes:
> Or is what you mean that some Schemes, when asked for the imag-part of
> 2.0, may return 0.0 rather than 0?
Yes, that's exactly what I mean. I know that SCM and Gauche do this,
and I suspect it's quite common.
> I can check for that possibility when I'm back home.
>> Another test that would be worthwhile is this:
>> (list (eqv? +0.0 -0.0)
>> (eqv? (make-rectangular +0.0 1.0)
>> (make-rectangular -0.0 1.0))
>> (eqv? (make-rectangular 1.0 +0.0)
>> (make-rectangular 1.0 -0.0))
>> I wouldn't be surprised if some Schemes distinguish signed zeroes in the
>> real part but not in the imaginary part. If an implementation discards
>> inexact zero imaginary parts, then it probably discards the sign as well
>> as the exactness.
> I'll try that.
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