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Display Numpy array in Fortran order
• Last Updated : 01 Oct, 2020

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 package``import` `numpy as np`` ` `# creating a Numpy array``num_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 Fortan 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 Fortan 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 array``num_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 Fortan 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 Fortan 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 array``num_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 Fortan 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 Fortan 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

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