numpy.binary_repr — NumPy v1.11 Manual (original) (raw)
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 if num is negative. |
|---|---|
| Returns: | bin : str Binary representation of num or two’s complement of num. |
See also
Return a string representation of a number in the given base system.
Notes
binary_repr is equivalent to using base_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'