NumPy: Convert the raw data in an array to a binary string and then create an array
Raw Array to Binary String/Back
Write a NumPy program to convert raw array data to a binary string and create an array.
Sample Solution:
Python Code:
# Importing the NumPy library and aliasing it as 'np'
import numpy as np
# Creating a NumPy array 'x' containing floating-point values
x = np.array([10, 20, 30], float)
# Printing a message indicating the original array will be displayed
print("Original array:")
# Printing the original array 'x' with its elements
print(x)
# Converting the array 'x' to a binary string using the 'tostring()' method
s = x.tostring()
# Printing a message indicating the display of the binary string array
print("Binary string array:")
# Printing the binary string representation of array 'x'
print(s)
# Printing a message indicating the array creation using 'fromstring()'
print("Array using fromstring():")
# Creating a new NumPy array 'y' by converting the binary string 's' back to an array using 'fromstring()'
# Note: This method may be deprecated in future versions of NumPy.
y = np.fromstring(s)
# Printing the array 'y' obtained from the binary string
print(y)
Sample Output:
Original array: [ 10. 20. 30.] Binary string array: b'\x00\x00\x00\x00\x00\x00$@\x00\x00\x00\x00\x00\x004@\x00\x00\x00\x00\x00\x00>@' Array using fromstring(): [ 10. 20. 30.]
Explanation:
In the above code –
x = np.array([10, 20, 30], float): Create a NumPy array 'x' with the elements 10, 20, and 30 of float data type.
s = x.tostring(): This line converts the NumPy array 'x' to a binary string 's' using the 'tostring()' method. Note that since NumPy 1.9, the preferred method is 'tobytes()' instead of 'tostring()'.
y = np.fromstring(s): Create a new NumPy array 'y' from the binary string 's' using the 'np.fromstring()' function. The new array 'y' will have the same elements as the original array 'x'.
Python-Numpy Code Editor: