Convert array of Binary objects to strings in Python 3

Question

I am using python-3.x, and I am trying to convert a list of a numpy array "Binary's" to decimal numbers, as I know I need to convert these Binary's first to Strings then I can convert them to Decimal ex:

1.Binary = 101011111 >>> 2.String= '101011111' >>>>> 3.decimal= 351

binary= '101011111'
binary = int(binary, 2)
print (binary)

But is there any way to convert a list of Binary's straightaway to decimal I don't want to convert them to Strings?

1.Binary = 101011111 >>> 2.decimal= 351

My input is:
Type: int64
Size:(3, 8)
Value: array:([[1,0,0,1,1,0,0,0],
               [1,1,1,1,1,0,0,0],
               [1,0,0,1,1,1,0,1]])

the output:  ([[152],
               [248],
               [157]])

binary? decimal? it's data _representation_. What's your input data? — Jean-François Fabre, Jun 18 '17 at 19:28
My input is: Type: int64 - Size:(3, 8) - Value: array ([[1,0,0,1,1,0,0,0], [1,1,1,1,1,0,0,0], [1,0,0,1,1,1,0,1]]) — azeez, Jun 18 '17 at 19:48
So I need to get another array contains the Value in decimal — azeez, Jun 18 '17 at 19:50
So you have a `numpy` array? Can you please edit your post to include your actual input and desired output? — juanpa.arrivillaga, Jun 18 '17 at 20:14

JohanL · Accepted Answer · 2017-06-19T04:51:48.673

Since your binary numbers are built from arrays, each array position represents a certain base value (2**n) or a left shift (<< n). This, together with the broadcasting of numpy, allows a solution like:

binary = np.array([[1, 0, 0, 1, 1, 0, 0, 0],
                   [1, 1, 1, 1, 1, 0, 0, 0],
                   [1, 0, 0, 1, 1, 1, 0, 1]])

wordlength = binary.shape[1]
shift = np.arange(wordlength-1, -1, -1)

decimal = np.sum(binary << shift, 1)

Thus, I generate a simple range from n-1 down to 0 which I then broadcast and use to shift each binary digit to get its value. Then I just sum up the values along the dimension of each binary number.

Convert array of Binary objects to strings in Python 3

1 Answers1