numpy-ndarray.copy()-function

Python NumPy ndarray.copy() Function

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NumPy ndarray.copy() Function:

The ndarray.copy() function of the NumPy module returns a duplicate or copy of the array.

Syntax:

numpy.ndarray.copy(order='C')

Parameters

order: This is optional. It controls the memory layout of the copy. It can accept values from ‘C’, ‘F’, ‘A’, and ‘K’. The default value is ‘C’.

  • ‘C’ – denotes the C order (row major).
  • ‘F’ –  stands for the F order (column major).
  • ‘A’ – means F if a is Fortran contiguous, otherwise, it is C.
  • ‘K’ – as closely as possible it matches the layout of a.

Return Value:

A duplicate/copy of the array is returned.

NumPy ndarray.copy() Function in Python

Example

Approach:

  • Import numpy module using the import keyword.
  • Pass the list(multi-dimensional) as an argument to the array() function to create an array.
  • Store it in a variable.
  • Copy the elements of the given first array into another using the copy() function.
  • Store it in a variable.
  • Print the id of the given original array using the id() function.
  • Print the given original array.
  • Print the id of the copied array using the id() function.
  • Print the copied array.
  • Modify some random element of the copied array.
  • Here it Modifies the element of the copied array but does not change the given original array.
  • Print the given original array after modification.
  • Print the copied array after modification.
  • The Exit of the Program.

Below is the implementation:

# Import numpy module using the import keyword
import numpy as np
# Pass the list(multi-dimensional) as an argument to the array() function to create an array.
# Store it in a variable.
gvn_arry = np.array([[10,11,12],
              [13,14,15]])

# Copy the elements of the given first array into another using the copy() function
# Store it in a variable.
arry_copy = gvn_arry.copy()

# Print the id of the given original array using the id() function
print("The id of the given original array = ", id(gvn_arry))
# Print the given original array.
print("The given original array:")
print(gvn_arry)

# Print the id of the copied array using the id() function
print("The id of the copied array = ", id(arry_copy))
# Print the copied array.
print("The copied array:")
print(arry_copy)

# Modify some random element of copied array.
# Here it Modifies the element of copied array but does not
# change the given original array
arry_copy[0,0] = 90
# Print the given original array after modification
print("The given original array after modification:")
print(gvn_arry)
# Print the copied array after modification.
print("The copied array after modification:")
print(arry_copy)

Output:

The id of the given original array = 140361216533248
The given original array:
[[10 11 12]
 [13 14 15]]
The id of the copied array = 140361216532528
The copied array:
[[10 11 12]
 [13 14 15]]
The given original array after modification:
[[10 11 12]
 [13 14 15]]
The copied array after modification:
[[90 11 12]
 [13 14 15]]