# Python – Numpy Array Column Deletion

Given a numpy array, write a programme to delete columns from numpy array.

Examples –

```Input: [['akshat', 'nikhil'], ['manjeeet', 'akash']]
Output:  [['akshat']['manjeeet']]

Input:  [[1, 0, 0, 1, 0], [0, 1, 2, 1, 1]]
Output:  [[1 0 1 0][0 2 1 1]]
```

Given below are various methods to delete columns from numpy array.

Method #1: Using np.delete()

 `# Python code to demonstrate ` `# deletion of columns from numpy array ` ` `  `import` `numpy as np ` ` `  `# initialising numpy array ` `ini_array ``=` `np.array([[``1``, ``0``, ``0``, ``1``, ``0``], ` `                        ``[``0``, ``1``, ``2``, ``1``, ``1``]]) ` `                         `  ` `  `# deleting second column from array ` `result ``=` `np.delete(ini_array, ``1``, ``1``) ` ` `  `# print result ` `print` `(``"Resultant Array :"``+``str``(result)) `

Output:

```Resultant Array :[[1 0 1 0]
[0 2 1 1]]
```

Method #2: Using compress() and logical_not()

 `# Python code to demonstrate ` `# deletion of columns from numpy array ` ` `  `import` `numpy as np ` ` `  `# initialising numpy array ` `ini_array ``=` `np.array([[``1``, ``0``, ``0``, ``1``, ``0``], [``1``, ``2``, ``0``, ``0``, ``1``]]) ` `z ``=` `[``False``, ``True``, ``False``, ``False``, ``False``] ` `                         `  ` `  `# deleting second column from array ` `result ``=` `ini_array.compress(np.logical_not(z), axis ``=` `1``) ` ` `  `# print result ` `print` `(``"Resultant Array :"``+``str``(result)) `

Output:

```Resultant Array :[[1 0 1 0]
[1 0 0 1]]
```

Method #3: Using logical_not()

 `# Python code to demonstrate ` `# deletion of columns from numpy array ` ` `  `import` `numpy as np ` ` `  `# initialising numpy array ` `ini_array ``=` `np.array([[``1``, ``0``, ``0``, ``1``, ``0``], [``1``, ``2``, ``0``, ``0``, ``1``]]) ` `z ``=` `[``False``, ``True``, ``False``, ``False``, ``False``] ` `                         `  ` `  `# deleting second column from array ` `result ``=` `ini_array[:, np.logical_not(z)] ` ` `  `# print result ` `print` `(``"Resultant Array :"``+``str``(result)) `

Output:

```Resultant Array :[[1 0 1 0]
[1 0 0 1]]
```

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