Robert Kern wrote: > Christopher Barker wrote: > >> I wonder if there are any C math libs that do a better job than you'd >> expect from standard FP? (short of unlimited precision ones) >> > > With respect to π and the zeros of sin() and cos()? Not really. If > numpy.sin(numpy.pi) were to give you 0.0, it would be *wrong*. numpy.sin() is > supposed to give you the most accurate result representable in > double-precision > for the input you gave it. numpy.pi is not π. > > True, but since the string literal "numpy.pi" is not the same as the string literal "3.1415926535897931" there's no reason in principle why "numpy.py" couldn't symbolically represent the exact value; of course, since numpy does not otherwise support symbolic computation, such an adoption would be frivolous and rather silly (but then the Pythons were never afraid of being silly). :-)
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