# Matrix – How to Use It Properly

By | October 24, 2022

The concept of a matrix is simple enough. It’s a device that takes an input and outputs the product of that input and another variable. For example, in the math world, you can image a matrix as a way to model the relationship between two variables. It’s also known as a scalar or linear algebra equation.
In this article, you will learn how to use matrices effectively in your own work as an engineer, and how they can be used by other people in your organization to solve problems and achieve goals.

Unless you have some kind of magical crystal ball, you’re going to have to accept the fact that your business is going to grow and change over time. While it might feel like an oncoming wave of negativity when your initial optimism about a new venture is dashed, there’s actually nothing wrong with that. It means you’re taking action sooner rather than later.
That being said, as great as growth can be, it can also be scary. Especially for those who are just getting started. To keep things positive but realistic, we created the following matrix to help you manage your expansionary ambitions:

## Matrix – How to Use It Properly Matrices are a ubiquitous math tool that you’ll find your way into for any advanced number theory class, even if you didn’t know it beforehand. They make up more than half of the content in my advanced linear algebra textbook as well as most other vector calculus-based books. But not all matrices are created equal. Thankfully, there is good news: matrices can be used in a variety of ways to get the most out of them. The key lies in understanding their purpose and how they are used in algorithms. In this article, we’ll take a quick look at the basics of a matrix before delving into the nitty-gritty details of its use in algorithms. Keep reading to discover everything you need to know about using a matrix creatively!

## What Is a Matrix?

A matrix is a group of numbers that, when multiplied together, produce a new number. For example, a 4×4 matrix can be thought of as a group of numbers where the first 4 numbers are multiplied together to form a number that is the sum of the other 3 numbers. This new number is the product of the 4 numbers. A square matrix can be thought of as a group of numbers that are all the same length. In this case, the length of the matrix equals the number of rows and columns.

## How to Use a Matrix

The first thing you should know about using a matrix is that it’s not multiplication. In fact, most books on matrix business will tell you that you should never use a matrix to perform multiplication. This is wrong. Matrices can be used to perform multiplication. But, more importantly, you can use them to perform addition and different types of division. You should always start with the multiplication of a small matrix before moving on to the more complex addition and subtraction problems that might come up. It’s better to be safe than sorry! Here’s how to use a matrix to perform multiplication: Multiply a small matrix by another small matrix. Do the same for the other rows and columns of the original matrix. Add up the products of all the rows and columns in the final matrix. If you’re performing a scalar multiplication, add the products of the scalar and the matrix. Otherwise, divide the total by the number of rows and the number of columns in the original matrix. Use a small matrix to represent a large one. A good rule of thumb is to use a square matrix to represent a rectangular one and a rectangular matrix to represent a square one.

## Why Use a Matrix?

A useful application of a square matrix is in optimization. Through optimization, you could try to guess the answer to a question and then check if your guess is correct by running an algorithm on a computer. A square matrix could help you get a more accurate result because of its closeness to the original data. Another reason to use a matrix is for encryption. A square matrix could easily be represented as a number inside of a secret message. With a little mathematics and a little bit of cryptography, you could store a lot of data in a small space without having to worry about security breaches.

## Tip-1: Multiplying Matrices Together

Unfortunately, you can’t just square one matrix and then randomly multiply the other 2 matrices together. This will blow up your computer. You have to use a technique called multiplication to get a meaningful answer. Multiplying matrices together is done by putting a “cross-over” in the middle of the matrix. You can think of the “cross-over” as being at the intersection of 2 matrices. The end result is a new matrix that contains the product of the 2 original matrices. Here’s how to multiply 2 matrices together: In the example above, the A matrix is made up of the numbers 1, 2, 3, and 4. The B matrix is made up of numbers 5, 6, 7, and 8. You can think of the multiplication of matrices as crosstalk between 2 dogs. You can’t “see” the numbers in the matrices because they are “under the bed”. However, the “under the bed” noises from one dog can cause the other to squeak.

## Tip-2: Using Sums of Matrices

One way to use a small matrix to represent a large one is to create a “sum of matrices”. In this case, you will simply add the sums of the rows and the columns of the smaller matrix to get the total of the original matrix. Here’s an example: What do you get when you add the sums of the 3 rows and the 3 columns of the small A matrix above? Well, you get a 4-element vector. That’s right! You get a vector of numbers: (1, 2, 3, 4). Now, you could try to find the product of all 4-vectors in the original matrix by hand. That would take a long time, and you’d have a better chance of losing your place in the matrix. A better and easier way to do it is with a sum of matrices. Here’s how: A small matrix can be used to represent a large one. A small matrix can also be used to represent a small matrix. A small matrix can be represented as a sum of matrices. Here’s how: A small matrix can be represented as a sum of matrices.

## Tip-3: Using Products of Matrices

A final method to use a small matrix to represent a large one is by using the products of the rows and the columns of the smaller matrix. Here’s an example: What do you get when you multiply the products of the 3 rows and the 3 columns of the small A matrix above? You get a 4-element vector: (1, 2, 3, 4). Now, you could try to find the product of all 4-vectors in the original matrix by hand. But why should you when you can do it the easy way, and the products of the rows and columns of a small matrix are easy to find? Instead of finding the product of all 4-vectors in the original matrix, you can find the sum of the products of all 4-vectors in the original matrix. This will give you the total of the elements in all 4-vectors: 1+2+3+4. Now, you can see why this is a good way to use a small matrix to represent a large one: the elements are easy to find and the total of all elements is relatively easy to calculate.

## Conclusion

All in all, a matrix is a group of numbers that, when multiplied together, can give you a new number. Use a matrix creatively by performing multiplication, addition and different types of division. Remember: a square matrix can also be used as a sum of matrices.