Fortran order/ array is a special case in which all elements of an array are stored in column-major order. Sometimes we need to display array in fortran order, for this numpy has a function known as numpy.nditer().
Syntax: numpy.nditer(op, flags=None, op_flags=None, op_dtypes=None, order=’K’, casting=’safe’, op_axes=None, itershape=None, buffersize=0)
Example 1:
Python3
# importing Numpy packageimport numpy as np# creating a Numpy arraynum_array = np.arange(12).reshape(3, 4)print("Array:")print(num_array)# Display array in Fortran order# using numpy.nditer()print("\nElements of the array in Fortran array:")for num_array in np.nditer(num_array, order="F"): print(num_array, end=' ') |
Output:
Array: [[ 0 1 2 3] [ 4 5 6 7] [ 8 9 10 11]] Elements of the array in Fortran array: 0 4 8 1 5 9 2 6 10 3 7 11
Example 2:
Python3
# importing Numpy package import numpy as np# creating a Numpy arraynum_array = np.arange(12).reshape(2, 6) print("Array:")print(num_array)# Display array in Fortran order # using numpy.nditer() print("\nElements of the array in Fortran array:")for num_array in np.nditer(num_array, order="F"): print(num_array,end=' ') |
Output:
Array: [[ 0 1 2 3 4 5] [ 6 7 8 9 10 11]] Elements of the array in Fortran array: 0 6 1 7 2 8 3 9 4 10 5 11
Example 3:
Python3
# importing Numpy package import numpy as np# creating a Numpy arraynum_array = np.arange(42).reshape(6, 7) print("Array:")print(num_array)# Display array in Fortran order # using numpy.nditer() print("\nElements of the array in Fortran array:")for num_array in np.nditer(num_array, order="F"): print(num_array,end=' ') |
Output:
Array: [[ 0 1 2 3 4 5 6] [ 7 8 9 10 11 12 13] [14 15 16 17 18 19 20] [21 22 23 24 25 26 27] [28 29 30 31 32 33 34] [35 36 37 38 39 40 41]] Elements of the array in Fortran array: 0 7 14 21 28 35 1 8 15 22 29 36 2 9 16 23 30 37 3 10 17 24 31 38 4 11 18 25 32 39 5 12 19 26 33 40 6 13 20 27 34 41
