# How to Add a Column to a NumPy Array (With Examples)

You can use one of the following methods to add a column to a NumPy array:

Method 1: Append Column to End of Array

```np.append(my_array, [[value1], [value2], [value3], ...], axis=1)
```

Method 2: Insert Column in Specific Position of Array

`np.insert(my_array, 3, [value1, value2, value3, ...], axis=1) `

The following examples show how to use each method in practice.

### Example 1: Append Column to End of NumPy Array

Suppose we have the following NumPy array:

```import numpy as np

#create NumPy array
my_array = np.array([[1, 2, 3, 4], [5, 6, 7, 8]])

#view NumPy array
my_array

array([[1, 2, 3, 4],
[5, 6, 7, 8]])```

We can use the following syntax to add a column to the end of the NumPy array:

```#append column to end of NumPy array
new_array = np.append(my_array, [, ], axis=1)

#view updated array
new_array

array([[ 1,  2,  3,  4, 10],
[ 5,  6,  7,  8, 13]])```

### Example 2: Insert Column in Specific Position of NumPy Array

Suppose we have the following NumPy array:

```import numpy as np

#create NumPy array
my_array = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]])

#view NumPy array
my_array

array([[1, 2, 3],
[4, 5, 6],
[7, 8, 9]])```

We can use the following syntax to insert a new column before the column in index position 2 of the NumPy array:

```#insert new column before column in index position 2
new_array = np.insert(my_array, 2, [10, 13, 19], axis=1)

#view updated array
new_array

array([[ 1,  2, 10,  3],
[ 4,  5, 13,  6],
[ 7,  8, 19,  9]])```

Notice that the new column of values has been inserted before the column in index position 2.