python Programming Glossary: ieee
How do you get the next value in the floating-point sequence? http://stackoverflow.com/questions/10420848/how-do-you-get-the-next-value-in-the-floating-point-sequence easy to write a Python function that does this assuming IEEE 754 floating point. The IEEE 754 binary floating point formats.. that does this assuming IEEE 754 floating point. The IEEE 754 binary floating point formats are rather cleverly designed.. negative zero. Below is a standards compliant version of IEEE 754's nextUp function in Python. It covers all the corner cases...
Python 3.x rounding behavior http://stackoverflow.com/questions/10825926/python-3-x-rounding-behavior a misconception that there is only one method of rounding. IEEE 754 the international standard for floating point math defines.. options but round toward even is the default as it is in IEEE 754. Apparently the engineer who implemented the round command..
Python: Possible to share in-memory data between 2 separate processes http://stackoverflow.com/questions/1268252/python-possible-to-share-in-memory-data-between-2-separate-processes MB of shared memory all the 16M floats in double precision IEEE representation laid end to end with a little shim on top to..
Strange behaviour with floats and string conversion http://stackoverflow.com/questions/13345334/strange-behaviour-with-floats-and-string-conversion with the accuracy of floats. I thought Python would use IEEE 754 single precicion floats. So I've checked it like this #include.. zeroes. This is guaranteed correct for 64 bit floats by IEEE 754. Since 2.7 and 3.1 Python uses a more intelligent algorithm.. . This is because 0.1 0.1 0.01 is False under IEEE 754 parsing and arithmetic that is the nearest 64 bit floating..
Why 0 ** 0 equals 1 in python http://stackoverflow.com/questions/14414430/why-0-0-equals-1-in-python 0 0 1 and Möbius sided with him... As applied to computers IEEE 754 recommends several functions for computing a power. It defines..
Why doesn't Python's mmap work with large files? http://stackoverflow.com/questions/1661986/why-doesnt-pythons-mmap-work-with-large-files memory mmap share improve this question From IEEE 1003.1 The mmap function shall establish a mapping between a..
Why python doesn't have a sign() function? http://stackoverflow.com/questions/1986152/why-python-doesnt-have-a-sign-function sign this way and it will still be compatible with the IEEE stuff mentioned by others sign functools.partial math.copysign..
floating point equality in Python and in general http://stackoverflow.com/questions/3049101/floating-point-equality-in-python-and-in-general deterministic or undefined behavior. There is a standard IEEE 754 which implementations must conform to not to claim they..
Python: sort function breaks in the presence of nan http://stackoverflow.com/questions/4240050/python-sort-function-breaks-in-the-presence-of-nan EDIT I now agree that this isn't in violation of the IEEE standard. However it's a bug from any common sense viewpoint.. Clear prose from GNU C manual but applies to all modern IEEE754 based floating point So the possible solutions are remove..
Increment a python floating point value by the smallest possible amount http://stackoverflow.com/questions/6063755/increment-a-python-floating-point-value-by-the-smallest-possible-amount math libraries Visual C C Boost and Java all implement the IEEE recommended nextafter functions or methods. I do not honestly.. # not extensively QA'd... import math # 'double' means IEEE 754 double precision c 'double' epsilon math.ldexp 1.0 53 #.. 0.5 epsilon 0.5 maxDouble float 2 1024 2 971 # From the IEEE 754 standard minDouble math.ldexp 1.0 1022 # min positive normalized..
How to check for NaN in python? http://stackoverflow.com/questions/944700/how-to-check-for-nan-in-python the float x is a NaN not a number . NaNs are part of the IEEE 754 standards. Operation like but not limited to inf 0 inf inf..
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