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numpy.binary_repr(num, width=None)
[source] -
Return the binary representation of the input number as a string.
For negative numbers, if width is not given, a minus sign is added to the front. If width is given, the two?s complement of the number is returned, with respect to that width.
In a two?s-complement system negative numbers are represented by the two?s complement of the absolute value. This is the most common method of representing signed integers on computers [R16]. A N-bit two?s-complement system can represent every integer in the range to .
Parameters: num : int
Only an integer decimal number can be used.
width : int, optional
The length of the returned string if
num
is positive, the length of the two?s complement ifnum
is negative.Returns: bin : str
Binary representation of
num
or two?s complement ofnum
.See also
-
base_repr
- Return a string representation of a number in the given base system.
Notes
binary_repr
is equivalent to usingbase_repr
with base 2, but about 25x faster.References
[R16] (1, 2) Wikipedia, ?Two?s complement?, http://en.wikipedia.org/wiki/Two?s_complement Examples
>>> np.binary_repr(3) '11' >>> np.binary_repr(-3) '-11' >>> np.binary_repr(3, width=4) '0011'
The two?s complement is returned when the input number is negative and width is specified:
>>> np.binary_repr(-3, width=4) '1101'
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numpy.binary_repr()
2017-01-10 18:12:57
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