Python Numpy.pad Function
In Python, we have NumPythe array module to create and use arrays. Arrays can have different sizes and dimensions. Padding is a useful method that can be used to compensate for the size of an array. We can mutate an array and add some padding values to change its shape and size.
There are other methods we can use to reshape the array. Nevertheless, this function is beneficial because it automatically resizes the array memory after use.
numpy.pad()The function is used to achieve this. The following code shows an example of this function.
import numpy as np
a = [1, 2, 3, 4]
b = np.pad(a, (3, 2), mode="constant", constant_values=(0, 5))
print(b)
Output:
[0 0 0 1 2 3 4 5 5]
In the example above, the first argument (3,2)tuple specifies to add 3 elements before the axis and 2 elements at the end of the axis.
modeThe parameter specifies what type of values will be used when filling the array. In our code, we fill the array with constants 0 and 5, but we can change this pattern to different types such as median, mean, empty, wrapetc. Each pattern provides different elements to fill the array with.
We can also use this function with multidimensional arrays. For example,
import numpy as np
a = np.array(
[[1.0, 1.0, 1.0, 1.0, 1.0], [1.0, 1.0, 1.0, 1.0, 1.0], [1.0, 1.0, 1.0, 1.0, 1.0]]
)
b = np.pad(a, [(0, 1), (0, 1)], mode="constant")
print(b)
Output:
[[1. 1. 1. 1. 1. 0.]
[1. 1. 1. 1. 1. 0.]
[1. 1. 1. 1. 1. 0.]
[0. 0. 0. 0. 0. 0.]]
For reprinting, please send an email to 1244347461@qq.com for approval. After obtaining the author's consent, kindly include the source as a link.
Related Articles
Writing logs to a file in Python
Publish Date：2025/05/06 Views：132 Category：Python
-
This tutorial will show you how to write logs to files in Python. Use the module in Python logging to write logs to files Logging is used to debug a program and find out what went wrong. logging The log module is used to log data to a file
Comparing two dates in Python
Publish Date：2025/05/06 Views：97 Category：Python
-
This tutorial explains how to compare two dates in Python. There are multiple ways to determine which date is greater, so the tutorial also lists different sample codes to illustrate the different methods. Comparing two dates in Python usin
Reload or unimport modules in Python
Publish Date：2025/05/06 Views：58 Category：Python
-
Modules allow us to store definitions of different functions and classes in Python files, which can then be used in other files. pandas , NumPy , scipy , Matplotlib are the most widely used modules in Python. We can also create our own modu
Pausing program execution in Python
Publish Date：2025/05/06 Views：156 Category：Python
-
This tutorial will demonstrate various ways to pause a program in Python. Pausing the execution of a program or application is used in different scenarios, such as when a program requires user input. We may also need to pause the program fo
Importing modules from a subdirectory in Python
Publish Date：2025/05/06 Views：190 Category：Python
-
This tutorial will explain various ways to import modules from subdirectories in Python. Suppose we have a file in a subdirectory of our project directory and we want to import this file and use its methods in our code. We can import files
Sleeping for a number of milliseconds in Python
Publish Date：2025/05/06 Views：124 Category：Python
-
In this tutorial, we will look at various ways to pause or suspend the execution of a program in Python for a given amount of time. Let's say we want to pause the execution of a program for a few seconds to let the user read instructions ab
If not statement in Python
Publish Date：2025/05/06 Views：123 Category：Python
-
The statement in Python if checks a specific condition and executes a block of code if the condition is true. if not The does the opposite of if the statement. It tests if a condition is false and then executes some statements. Using if not
Enumerating a dictionary in Python
Publish Date：2025/05/05 Views：98 Category：Python
-
The function in Python enumerate() returns an object of enumeration type and adds a counter variable to iterate over a list or other type of collection. It makes looping over such objects easier. When we pass an enumeration object to list()
Changing dictionary values in Python
Publish Date：2025/05/05 Views：109 Category：Python
-
This tutorial will discuss various ways to change the value of a particular key in Python dictionary. We can do this by using the following methods. dict.update() method for cycle. Dictionary Unpacking dict.update() How to change dictionary
