I have a numpy binary array like this:
np_bin_array = [0 1 0 0 1 0 0 0 0 1 1 0 0 1 0 1 0 1 1 0 1 1 0 0 0 1 1 0 1 1 0 0 0 1 1 0 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
It was 8-bit string characters of a word originally, starting from the left, with 0's padding it out.
I need to convert this back into strings to form the word again and strip the 0's and the output for the above should be 'Hello'.
Thanks for your help!
You can firstly interpret the bits into an array, using numpy.packbits(), then convert it to an array of bytes by applying bytearray(), then decode() it to be a normal string.
The following code
import numpy
np_bin_array = [0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
print(bytearray(numpy.packbits(np_bin_array)).decode().strip("\x00"))
gives
Hello
np_bin_array is produced? I cannot reproduce the problem with a simple bool numpy array, I guess you are meaning something else?This one works to me. I had a boolean array though, so had to make an additional conversion.
def split_list(alist,max_size=1):
"""Yield successive n-sized chunks from l."""
for i in range(0, len(alist), max_size):
yield alist[i:i+max_size]
result = "".join([chr(i) for i in (int("".join([str(int(j)) for j in letter]), base=2) for letter in split_list(np_bin_array, 8)) if i != 0])
import numpy as np
np_bin_array = np.array([0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0])
bhello = ''.join(map(str, np_bin_array))
xhello = hex(int(bhello, 2)).strip("0x")
''.join(chr(int(xhello[i:i+2], 16)) for i in range(0, len(xhello), 2))I got it working with this:
np_bin_array = [0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
yy=[]
yy_word=""
yy=np.packbits(np_bin_array)
for i in yy:
if i:
j = chr(i)
yy_word += str(j)
print(yy_word)