# Exploring Complex Numbers and Numpy Angle Function

## Exploring Complex Numbers with NumPy Angle Function

Have you ever encountered a mathematical expression with the imaginary unit i or j? These expressions are known as complex numbers, and they play a vital role in multiple fields, including physics, engineering, and finance.

A complex number has two components, the real and imaginary parts, and is written in the form a + bi, where a and b are real numbers, and i represents the imaginary unit. In this article, we will focus on understanding complex numbers and the NumPy angle function used to work with them.

## Understanding Complex Numbers

A complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is the imaginary unit. The imaginary unit i is defined as the square root of negative one, and it helps define the imaginary or vertical component of the number.

For example, the number 3 + 4i is a complex number where 3 is the real component and 4 is the imaginary component. Similarly, the number 1 – 2i is a complex number where 1 is the real component, and -2 is the imaginary component.

You can add, subtract, multiply, and divide complex numbers using the same operations you use with real numbers.

## Function of NumPy Angle

NumPy is a popular Python library used extensively for numerical calculations and scientific computing. The NumPy angle function is used to compute the angle of a complex number in radians.

The angle is measured using the standard mathematical convention where zero degrees lie along the positive real axis. You can use NumPy angle function to find the angle of a single complex number or an array of complex numbers.

The output is always a float or an array of floats, representing the angle in radians.

## Syntax of NumPy Angle Function

The NumPy angle function takes a single argument representing the complex number or an array of complex numbers whose angle you want to compute. The syntax is as follows.

np.angle(z, deg=False)

where z is the complex number or the array of complex numbers whose angle you want to find, and deg is a Boolean flag. When deg is set to True, the output angle is in degrees; otherwise, it is in radians.

## Working with NumPy Angle

Let’s now look at some examples to see how to use the NumPy angle function in practice.

## NumPy angle of a Single Complex Number

Suppose you have a single complex number z = 1 + 2j. You can find the angle of this complex number using the NumPy angle function as follows.

## import numpy as np

z = 1 + 2j

angle = np.angle(z)

## print(angle)

Output: 1.1071487177940904

Here, the variable angle stores the value of the angle of the complex number in radians.

## NumPy angle of NumPy Array of Complex Numbers

You can also find the angle of an array of complex numbers using NumPy angle function. Suppose you have an array of complex numbers z_arr = np.array([2 + 2j, -3 – 3j, 4 – 2j]).

You can find the angles of all the complex numbers in the array as follows.

## import numpy as np

z_arr = np.array([2 + 2j, -3 – 3j, 4 – 2j])

angles = np.angle(z_arr)

## print(angles)

Output: [0.78539816 -2.35619449 -0.46364761]

Here, the variable angles stores an array of three angles, representing the angles of the corresponding complex numbers in the input array.

## Using deg Attribute to Get Output Angle in Degrees

By default, the output angle of the NumPy angle function is in radians. However, you can also get the output angle in degrees by setting the deg flag to True.

Let’s look at the previous example and modify it to get the angles in degrees.

## import numpy as np

z_arr = np.array([2 + 2j, -3 – 3j, 4 – 2j])

angles_deg = np.angle(z_arr, deg=True)

## print(angles_deg)

Output: [ 45. -135.

-26.56505118]

Here, the variable angles_deg stores an array of angles in degrees.

## Conclusion

In this article, we explored complex numbers and the NumPy angle function used to work with them. We learned that a complex number has two components, the real and imaginary parts, and can be written in the form a + bi.

We also saw that the NumPy angle function computes the angle of a complex number in radians and can be used to find the angle of a single complex number or an array of complex numbers. The use of deg flag allows us to get the output angle in degrees.

NumPy angle function is a powerful tool, and its application in numerical computations is limitless. We hope you found this article informative and helpful.

## Recapping NumPy Angle Function

In the previous part of this article, we explored complex numbers and the NumPy angle function used to work with them. We learned that a complex number has a real and an imaginary component, written in the form a + bi, and the NumPy angle function computes the angle of a complex number in radians.

The syntax of the NumPy angle function is straightforward. It takes a single argument, representing the complex number or an array of complex numbers whose angle you want to calculate.

The function’s output is always a float or an array of floats that represent the angle in radians or degrees. The deg flag allows you to switch between radians and degrees when the function returns the angle in degrees.

Now, let’s dive deeper into the topics covered in the previous part of this article to gain a better understanding of complex numbers and the NumPy angle function.

## Understanding Complex Numbers

Complex numbers can be challenging to understand upon first encountering them. The real component of a complex number is a standard real number that can be positive, negative, or zero, while the imaginary component is a multiple of i (or j), the imaginary unit.

For instance, we can write the complex number 4 + 5i, where the real component is 4, and the imaginary component is 5i. Similarly, we can write the complex number 6 – 7i, where the real component is 6, and the imaginary component is -7i.

We can add, subtract, multiply, and divide complex numbers, including variables with i, similar to how real numbers work. For example, (2 + 3i) + (4 – 5i) = 6 – 2i, (2 + 3i) * (4 – 5i) = 23 – 2i, and so on.

## Function of NumPy Angle

The NumPy angle function is part of the NumPy library, which is used for numerical calculations and scientific computing in Python. The primary function of the NumPy angle function is to calculate the angle of a complex number in radians.

The angle of a complex number represents the direction of the vector pointing to the complex number in the two-dimensional plane. For example, if we plot the complex number 2 + 3i in an Argand diagram, an x-y graph representing the complex plane, we can see that the vector starts from the origin (0,0) and points towards the point (2, 3).

The corresponding angle is the angle between the positive x-axis and the vector, measured in radians. The NumPy angle function takes a single argument, representing the complex number or an array of complex numbers whose angle you want to calculate.

The output of the NumPy angle function is always a float or an array of floats which represent the angle in radians.

## Syntax of NumPy Angle Function

The syntax of the NumPy angle function is simple and intuitive. The function takes a single argument, ‘z,’ that can be a complex number or an array of complex numbers, whose angle we wish to compute.

## The syntax of the NumPy angle is as follows:

np.angle(z, deg=False)

Here, ‘z’ represents the complex number or an array of complex numbers whose angle we wish to calculate, and ‘deg’ is a Boolean Flag. When set to True, it returns the angle in degrees.

Otherwise, it returns the angle in radians.

## Working with NumPy Angle

The NumPy angle function can be utilized in various ways, some of which are:

NumPy Angle of A Single Complex Number:

To calculate the angle of a single complex number using the NumPy angle function, we take the complex number as an argument of the function. For example, let’s say we have the complex number 3 + 4i.

To calculate the angle, we use the NumPy angle function as follows:

## import numpy as np

z = 3 + 4j

angle = np.angle(z)

## print(angle)

Here, the value of the angle of the complex number is printed to the console, and in this case, the output is 0.93 radians. NumPy Angle of NumPy Array of Complex Numbers:

To calculate the angles of an array of complex numbers, we pass the array as an argument of the NumPy angle function.

For instance, let’s say we have an array of the following complex numbers:

## import numpy as np

z_array = np.array([2 + 2j, -3 – 3j, 4 – 2j])

To find the angle of every complex number in the above array, we execute the following:

angles = np.angle(z_array)

## print(angles)

Here, the output represents the angle of each of the complex numbers in the array, respectively.

## Using Deg Attribute to Get Output Angle in Degrees

By default, the NumPy angle function returns the results in radians. However, one can get it in degrees by passing the deg Boolean flag set to True as shown below:

## import numpy as np

z_array = np.array([2 + 2j, -3 – 3j, 4 – 2j])

angles_deg = np.angle(z_array, deg=True)

## print(angles_deg)

Here, the output angle is returned in degrees, and it corresponds to the angle value in radians.

## Conclusion

In summary, complex numbers are an essential part of many scientific and engineering disciplines; they have both real and imaginary parts represented in the form a + bi. The NumPy angle function is a powerful tool used to calculate the angle of complex numbers in radians or degrees.

It can work with a single complex number or an array of complex numbers. The use of the deg flag allows one to switch between radians and degrees when the function returns the angle in degrees.

NumPy angle function is a crucial tool in numerical computations and scientific applications. In conclusion, the NumPy angle function is a significant tool in numerical computations and scientific applications that helps calculate the angle of a complex number in radians or degrees.

By understanding complex numbers and their properties, we can apply the NumPy angle function using simple syntax to find the angle of a single complex number or an array of complex numbers. The function’s usefulness lies in its ability to aid scientists, mathematicians, and engineers.

The ability to work with complex numbers in such a tool expands many applications, from robotics to physics. With the knowledge presented in this article, we hope readers can harness the power of Numpy and excel in their field of study.