Rust Math Library

Although Rust does not provide a standalone module for performing math operations, it provides a set of methods that allow us to perform mathematical operations.

Let us explore these methods and how we can use them to do math operations in Rust.

Rust f64 Primitive Type

Most math functions and methods are defined in the Rust f64 primitive type. This is a 64-bit floating-point value.

An example of an f64 type in Rust is as shown:

let i = 3.141_f64;

Using the f64 type, we access useful math functions as illustrated in this guide.

Square Root.

To get the square root of a number using Rust, we can use the sqrt function as shown in the example below:

fn main() {

let var = 121.0_f64;

println!("Square root of {} is {}: ", var, var.sqrt());

}

The above example should return the square root of 121.0.

Min and Max

Rust provides min and max functions to determine the minimum and maximum value for a given pair, respectively.

An example code is as shown:

fn main() {

let x = 100.23_f64;

let y = 3.0_f64;

println!("min value: {}", x.min(y));

println!("max value: {}", x.max(y));

}

The example above returns the minimum and maximum of the two values.

Absolute

We use the abs function to determine the absolute value for a given floating-point value. An example is as shown:

fn main() {

let j = -3.45_f64;

println!("{}", j.abs());

}

The code above should return the absolute value for the -3.45 as shown below:

Trigonometric Functions

Rust supports trigonometric functions such as tan, sin, cos and their inverses. Example usage is as shown:

fn main() {

let dg = 32.0_f64;

let inv = 0.39_f64;

println!("Tan: {}: ", dg.tan());

println!("Inverse Tan: {}: ", inv.atan());

println!("Sin: {}: ", dg.sin());

println!("Inverse Sin: {}: ", inv.asin());

println!("Cosine: {}: ", dg.cos());

println!("Inverse Cosine: {}: ", inv.acos());

}

You can also determine hyperbolic values for both tan, sin and cos using tanh, sinh, and cosh functions.

The output from the above program is as shown:

Cube Root

To determine the cube root of a value, use the cbrt function as shown in the example below:

let x = 8.0_f64;

println!("Cube root of 8: {}", x.cbrt())

The output is as shown:

Logarithm

To determine the logarithm of a specific value to a certain base, you can use the log function. The syntax is as shown:

log(self, base)

An example is as shown:

let x = 8.0_f64;

println!("Log of {} to base 10: {}", x, x.log(10.0));

The output is as shown:

Conclusion

This guide illustrates various mathematical functions and how to implement them in Rust. You can check the documentation shown below:

https://doc.rust-lang.org/std/primitive.f64.html#implementations