Status: Accepted
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 3060 by smi...@gmail.com: use of evalf() needs review
http://code.google.com/p/sympy/issues/detail?id=3060
In numbers, there are many cases where evalf() is being used only to test
if something reduces to a Number. It seems that these instances could be
changed to evalf(1) to speed them up.
Also, evalf() is being used to compute a value that is used in an
expression without testing to see what precision is needed. I don't recall
at the moment whether this will truncate any existing high-precision Floats
in the expression to 15-digits:
pi + Float('.1',22)
0.1 + pi
_.n()
3.24159265358979
Perhaps if the precision is None then the needed precision could be
autodetected rather than defaulting to 15.
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