Python Multidimensional NumPy Array: Size, Type, Dimensions, Shape

In this article, we’ll learn about creating a Python NumPy array (1D and 2D). Find the size, dimensions, type, and shape of the Python NumPy array. Also, we’ll find the data type of elements of the NumPy array. Eventually, we’ll include the images of the code as well.

So let’s get right into its implementation.

Python NumPy Array Creation

In our previous article, we discussed the Python NumPy array theoretically. Click here to read it out. In this article, we’ll discuss its implementation practically with proper code.

Let’s create these two arrays:

1. Python One-Dimensional NumPy Array
2. Python Two-Dimensional NumPy Array

1. Python One-Dimensional NumPy Array

Open the Jupyter Notebook or other IDE and import NumPy.

import numpy as np

We’ll use the numPy array and pass a list to it. See below:

array_1d = np.array([7,8,10])
print(array_1d)

Output

[ 7  8 10]

This is a one-dimensional Python NumPy array that has been created using a Python list.

2. Python Two-Dimensional NumPy Array

The process is the same but in this case, we’ve to pass lists inside the list so the outcome will come as a 2D NumPy array. See below:

array_2d = np.array([[3,2,14],[6,4,3]])    // can give array name of your choice
print(array_2d)

Output

[[ 3  2 14]
 [ 6  4  3]]

type(array_1d)

numpy.ndarray

The output specifies that the created array is a NumPy array. We can do the same for 2D arrays as well.

Find the Dimensions of the NumPy Array

Let’s find out if the arrays that we’ve created are one-dimensional, two-dimensional, or multi-dimensional. For that, we’ve to first write the name of the array and then use .dim to get the dimension. See below:

array_1d.ndim

Output

1

The output shows 1 which means the array is one-dimensional. Let’s test it with 2D as well. See below:

array_2d.ndim

Output

2

It shows 2 which means a 2D array.

Find the Size of the Python NumPy Array

Let’s find the length/size of the NumPy array. For that, we need to specify the name of the array and then use .size to get the size. See the below code:

array_1d.size

Output

3

Our 1D array has three items so the returned size is 3 as shown in the output. Let’s test it for the 2D array as well. See below:

array_2d.size

Output

6

In the above section, we can see that our 2D NumPy array has 6 items so the size is 6 as displayed in the above output.

Find the Shape of Python NumPy Array

Finding the shape of an array means how many it has rows or columns. We can use the name of the array and then use .shape to fetch the number of rows and columns. See below:

array_2d.shape

Output

(2, 3)

It means the specified 2D array has 2 rows and 3 columns. It’s specified inside a Python tuple. The first item represents the rows while the second item represents the columns.

Let’s try it with a 1D array as well. See below:

array_1d.shape

Output

(3,)

It indicates that the array is 1 dimensional with a length of 3.

Find the Data Type of Items of NumPy Array

To find the data type of items of the array, we’ve to write the name of array and the use .dtype to fetch the type of items. See below:

array_1d.dtype
array_2d.dtype

Output

dtype('int32')
dtype('int32')

Both arrays show a datatype of int in 32-bit format as all the items are in integer format. In this way, we can easily find the item’s data type within the array.

Source Code Images

Conclusion

In conclusion, we’ve learned how to create Python NumPy 1D and 2D arrays. Find the size, type, shape, and dimensions of the Python NumPy array. Also, we’ve learned how to find the data type of items of the NumPy array.

Visit our other articles to explore Python Numpy in more detail. Thank you for reading.