I have a following numpy array
a = np.array([[1,2,3,4 ,11, 12,13,14,21,22,23,24,31,32,33,34 ]], dtype=uint8)
when I print a i am getting the following output
[[ 1 2 3 4 11 12 13 14 21 22 23 24 31 32 33 34]]
How can i get the output in binary representation?
for example
[[ 00000001 00000010 00000011 00000100 ...]]
ArunRaj
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5 Answers 5
You can use numpy.binary_repr
It takes a number as input and returns its binary representation as a string. You can vectorize this function so that it can take an array as input:
np.vectorize(np.binary_repr)(a, width=8)
answered Apr 13, 2018 at 5:30
kuzand
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Try this.
np.array(map(bin, a.flatten())).reshape(a.shape)
answered Apr 17, 2014 at 6:28
Kei Minagawa
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3 Comments
user3543783
This is the fastest solution so far
Michael Herrmann
This gives
ValueError: cannot reshape array of size 1 into shape (1,16) on Python 3 and numpy 1.21.5.evn
@MichaelHerrmann you may be interested in
np.unpackbits(a).reshape(*a.shape,8). The 8 is for uint8. Replace with the number of bits in your dtype.this gives out as u required
[bin(x)[2:].zfill(8) for x in a]
out put
['00000001', '00000010', '00000011']
answered Apr 17, 2014 at 4:52
sundar nataraj
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2 Comments
user3543783
This works perfectly.Thanks.. It is taking similar time to using vectorize.
sundar nataraj
pls make it tick .. and ote up:)
How about this?
a = np.array([[1,2,3,4 ,11, 12,13,14,21,22,23,24,31,32,33,34 ]], dtype=uint8)
print [bin(n) for n in a[0]]
Using numpy's unpackbits, this can work too.
A=np.unpackbits(a, axis=0).T
print [''.join(map(str,a)) for a in A]
answered Apr 17, 2014 at 4:47
ysakamoto
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2 Comments
user3543783
Second one throws "TypeError: argument 2 to map() must support iteration"
ysakamoto
I think your array is not 2d. In your question you use two brackets
[[]].For uint8 you can use the builtin numpy function unpackbits. (As mentioned by @ysakamoto) First reshape array so it is 1 column wide. After that use unpackbits as stated below.
a = numpy.array([[1,2,3,4 ,11, 12,13,14,21,22,23,24,31,32,33,34 ]], dtype="uint8")
print(numpy.unpackbits(a.reshape(-1,1), axis=1))
output:
[[0, 0, 0, 0, 0, 0, 0, 1],
[0, 0, 0, 0, 0, 0, 1, 0],
[0, 0, 0, 0, 0, 0, 1, 1],
[0, 0, 0, 0, 0, 1, 0, 0],
[0, 0, 0, 0, 1, 0, 1, 1],
[0, 0, 0, 0, 1, 1, 0, 0],
[0, 0, 0, 0, 1, 1, 0, 1],
[0, 0, 0, 0, 1, 1, 1, 0],
[0, 0, 0, 1, 0, 1, 0, 1],
[0, 0, 0, 1, 0, 1, 1, 0],
[0, 0, 0, 1, 0, 1, 1, 1],
[0, 0, 0, 1, 1, 0, 0, 0],
[0, 0, 0, 1, 1, 1, 1, 1],
[0, 0, 1, 0, 0, 0, 0, 0],
[0, 0, 1, 0, 0, 0, 0, 1],
[0, 0, 1, 0, 0, 0, 1, 0]]
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