# Discovering the Concept of Pi within MATLAB’s Computational Framework

This article aims to provide a comprehensive understanding of pi and its representation within the popular programming language, MATLAB. We will delve into the mathematical principles behind pi, the d …

Updated November 6, 2023

*Hey! If you love Computer Vision and OpenCV as much as I do let's connect on Twitter or LinkedIn. I talk about this stuff all the time and build cool projects.*This article aims to provide a comprehensive understanding of pi and its representation within the popular programming language, MATLAB. We will delve into the mathematical principles behind pi, the different approaches to representing pi in MATLAB code samples, as well as the usefulness of this concept for Python Engineers and Computer Vision Experts.

## Introduction

Pi (π) is a special number, widely known for its significance in mathematics. It’s an irrational number, meaning it cannot be expressed as a fraction. Moreover, it’s an important constant within the field of geometry, since it relates to various geometric properties such as circles, ellipses, and tori.

In MATLAB, being a robust mathematical software tool with a rich set of functions for numerical computation, data visualization, and computer vision applications, we can find several built-in functions that deal directly with pi, or even provide ways to obtain its approximation. This article aims to shed light on these aspects so Python Engineers and Computer Vision Experts can effectively leverage MATLAB’s capabilities in their workflow.

## Understanding Pi in MATLAB

As a programming language designed for numerical computation and visualization, MATLAB offers multiple ways to interact with the concept of pi. It provides both direct access to its constant value through built-in functions and methods to approximate it based on certain algorithms.

### Built-in Pi Constant in MATLAB

In MATLAB, we can assign pi a fixed mathematical value by using the `pi`

function. We do not need to calculate or specify a particular decimal representation of pi every time we want to use it in our code. This function returns an approximation of the constant pi, which is typically accurate enough for most applications but might not be sufficient for high-precision calculations.

Here’s how you can call and display the value of pi in MATLAB:

```
piValue = pi;
disp(piValue)
```

The output will display approximately 3.141592653589743 (rounded to 14 decimal places). However, this number is not the exact value of pi since it cannot be represented by a finite decimal representation.

### Approximating Pi in MATLAB

For more precise calculations or computational tasks requiring higher precision, MATLAB provides an algorithm-driven method to calculate pi up to any desired level of accuracy. The `piApprox`

function from the built-in `symbolic`

toolbox allows users to generate a series expansion of pi using the Taylor series representation or by other algorithms like continued fractions and Machin’s formula.

To utilize this functionality, one should import the `symbolic`

toolbox first:

```
% Import symbolic toolbox
sym = sym;
% Use the piApprox function to calculate pi with given precision
piApproxValue = piApprox(100); % Calculate pi up to 100 decimal places
disp(piApproxValue)
```

In the example above, we have calculated pi up to 100 decimal places. The output will be similar to: `3.14159265358974320000000000000000000000000000000000`

## Implementing Pi in MATLAB Code Samples

Now that we have a clear understanding of pi’s representation within MATLAB, let us delve into a more practical application by calculating the area and circumference of a circle using pi as an essential component. In this example, we will use MATLAB to calculate the area of a circle of radius `R = 10`

.

```
% Calculate Area of a Circle with given radius
R = 10; % Radius of the circle
piValue = pi; % Use built-in function for pi constant value
areaValue = pi * R^2; % Calculate area using pi and radius squared
disp(areaValue)
```

The output will display approximately 314.1592653589743 (rounded to 14 decimal places). This can be further enhanced for more precise calculations by using the `piApprox`

function as described above.

Similarly, we can use pi in MATLAB to calculate the circumference of a circle with given radius:

```
% Calculate Circumference of a Circle with given radius
R = 10; % Radius of the circle
piValue = pi; % Use built-in function for pi constant value
circumferenceValue = 2 * pi * R; % Calculate circumference using pi and radius twice
disp(circumferenceValue)
```

The output will display approximately 62.83185470729925 (rounded to 14 decimal places). Again, we can improve the precision by utilizing the `piApprox`

function for a more accurate result.

## Conclusion

In conclusion, MATLAB offers Python Engineers and Computer Vision Experts with the necessary tools to incorporate pi into their workflow. From using the built-in `pi`

function for obtaining an approximation of pi to the more precise `piApprox`

function for higher accuracy in computational tasks, these resources enable efficient calculations that can significantly benefit applications within mathematics, geometry, and beyond. By understanding these concepts and code samples provided above, professionals in various fields can confidently use MATLAB as a powerful instrument for solving complex mathematical problems involving pi.