Comment #1 on issue 3013 by [email protected]: Float(Float) gives odd
result
http://code.google.com/p/sympy/issues/detail?id=3013
Changes in https://github.com/sympy/sympy/pull/998 allow the following:
S(12345678901234567890)/Float(1.0,22)
12345678901234567890.00
n=_
Float(n) # if it's already a Float, don't change prec
12345678901234567890.00
Float(n,22)
12345678901234567890.00
Float(n,20)
12345678901234567890.
Float(n,10)
1.234567890e+19
Float(n,22)
12345678901234567890.00
Float(n,23)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "sympy\core\numbers.py", line 409, in __new__
raise ValueError('Insufficient existing precision')
ValueError: Insufficient existing precision
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