I would like to manipulate arbitrarily large real numbers, for example:
a = 10**25+.1
round(a) # expected: 10000000000000000000000000
sage: 10000000000000000905969664
a.is_integer() # expected: False
sage: True
a - 10**25 # expected: 0.1
sage: 0.000000000000000
What is the appropriate function to use?
You can define a "real field" with as many bits of precision as follows (the default is 53):
sage: R = RealField(100)
sage: R
Real Field with 100 bits of precision
sage: a = R(10^25) + R(0.1)
sage: a
1.0000000000000000000000000100e25
sage: a.is_integer()
False
sage: a - 10**25
0.10000610351562500000000000000
If you want a better result for that last question, just add more bits of precision.
Asked: 2022-02-09 22:06:47 +0200
Seen: 161 times
Last updated: Feb 09 '22
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