## Expand description

Fast, approximate versions of mathematical functions.

This crate includes implementations of “expensive” mathematical functions that are much faster, at the expense of some accuracy. All functions have good guarantees on accuracy to some degree (both relative and absolute).

## §Installation

Add this to your Cargo.toml

```
[dependencies]
fast-math = "0.1"
```

## §Examples

```
let x = 10.4781;
let approx = fast_math::log2(x);
let real = x.log2();
// they should be close
assert!((approx - real).abs() < 0.01);
```

## Functions§

- Compute a fast approximation of the arctangent of
`x`

. - Compute a fast approximation of the four quadrant arctangent of
`y`

and`x`

. - Compute a fast approximation of the inverse tangent for
`|x| < 1`

. - Compute a fast approximation to
*e*^{x}. - Compute a fast approximation to 2
^{x}. - Compute a fast approximation to 2
^{x}for -151 ≤`x`

≤ 151. - Compute a fast approximation to
*e*^{x}for -104 ≤`x`

≤ 104. - Compute a fast approximation of the base-2 logarithm of
`x`

. - Compute a fast approximation of the base-2 logarithm of
**positive, finite, non-denormal**`x`

.