---
name: "math"
section: "3erl"
platform: "linux"
package: "erlang-manpages"
version: "1:25.2.3+dfsg-1+deb12u4"
release: "Debian 12 (Bookworm)"
platforms: ["linux"]
url: "https://new.carta.tech/math/3erl"
---

# math(3erl)

Mathematical functions.

## NAME

math - Mathematical functions.

## DESCRIPTION

This module provides an interface to a number of mathematical functions.

**Note:**

Not all functions are provided on all platforms. In particular, the *erf/1* and *erfc/1* functions are not provided on Windows.

## EXPORTS

```
acos(X) -> float()
```

```
acosh(X) -> float()
```

```
asin(X) -> float()
```

```
asinh(X) -> float()
```

```
atan(X) -> float()
```

```
atan2(Y, X) -> float()
```

```
atanh(X) -> float()
```

```
ceil(X) -> float()
```

```
cos(X) -> float()
```

```
cosh(X) -> float()
```

```
exp(X) -> float()
```

```
floor(X) -> float()
```

```
fmod(X, Y) -> float()
```

```
log(X) -> float()
```

```
log10(X) -> float()
```

```
log2(X) -> float()
```

```
pow(X, Y) -> float()
```

```
sin(X) -> float()
```

```
sinh(X) -> float()
```

```
sqrt(X) -> float()
```

```
tan(X) -> float()
```

```
tanh(X) -> float()
```

Types:

Y = X = number()\

A collection of mathematical functions that return floats. Arguments are numbers.

```
erf(X) -> float()
```

Types:

X = number()\

Returns the error function of *X*, where:

```
erf(X) = 2/sqrt(pi)*integral from 0 to X of exp(-t*t) dt.
```

```
erfc(X) -> float()
```

Types:

X = number()\

*erfc(X)* returns *1.0* - *erf(X)*, computed by methods that avoid cancellation for large *X*.

```
pi() -> float()
```

A useful number.

## LIMITATIONS

As these are the C library, the same limitations apply.