On 2017-03-29 11:24, Dima Pasechnik wrote:
Is the following a bug, or not:
A bug in what :-)
This is already interesting (on Linux):
sage: float(RR(3).sqrt())
1.7320508075688772
sage: float(RDF(3).sqrt())
1.7320508075688772
sage: float(RR(sqrt(3)))
1.7320508075688772
sage: float(RDF(sqrt(3)))
1.7320508075688774
The last one is actually more wrong (error: 0.55 ulp) than the first
three (error: 0.45 ulp). Interestingly, it is precisely this wrong
answer which is used in the doctest.
I think it's fair to say that the doctest isn't robust.
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