math(3erl) Erlang Module Definition math(3erl)

# 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()

```

Ratio of the circumference of a circle to its diameter.

Floating point approximation of mathematical constant pi.

```
tau() -> float()

```

Ratio of the circumference of a circle to its radius.

This constant is equivalent to a full turn when described in radians.

The same as 2 * pi().

# LIMITATIONS¶

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

 stdlib 5.2 Ericsson AB