# Data Science ## numpy.delete: How to Remove Elements from a NumPy Array

To remove an element from a NumPy array: Specify the index of the element to remove. Call the numpy.delete() function on the array for the given index. For example: Output: This is the quick answer. However, there is a lot more when it comes to removing elements from a NumPy array. In this guide, you … ## numpy.append(): How to Add Elements to a NumPy Array

A NumPy array does not have a built-in append method. Instead, to append elements to a NumPy array, use a separate numpy.append() function. For example: Output: Notice how numpy.append() creates a new copy of the original array. It does not directly append values to it. In this guide, you learn: How appending NumPy arrays work. … ## NumPy How to Create an Empty Array (A Complete Guide)

To create an empty NumPy array: For instance, let’s create an empty array with no elements: Output: However, creating an array without elements rarely makes any sense. Instead, you should know and specify the shape of the final array in advance. For instance, let’s create an empty 2D array: Output (contains arbitrary values due to … ## NumPy @ Operator—Matrix Multiplication in Python

In NumPy, the @ operator means matrix multiplication. For instance, let’s multiply two NumPy arrays that represent 2 x 2 matrices: Output: If you are familiar with matrix multiplication, I’m sure this answers your questions. However, if you do not know what matrix multiplication means, or if you are interested in how the @ operator … ## NumPy How to Concatenate Two Arrays

To concatenate two arrays with NumPy: Import numpy. Put two arrays in a list. Call numpy.concatenate() on the list of arrays. For instance: Output: This is a quick answer. To learn more ways to concatenate arrays and about their efficiency, please, stick around. 4 Ways to Concatenate 1D NumPy Arrays There are four built-in ways … ## NumPy How to Compare Two Arrays

To check if two NumPy arrays A and B are equal: Use a comparison operator (==) to form a comparison array. Check if all the elements in the comparison array are True. For example: This is the easiest approach to comparing two arrays. But this approach is not 100% reliable. Instead, you should consider using …