View Source math (stdlib v6.0)

Mathematical functions.

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.

Limitations

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

Summary

Functions

acos(X)

Equivalent to tanh/1

acosh(X)

Equivalent to tanh/1

asin(X)

Equivalent to tanh/1

asinh(X)

Equivalent to tanh/1

atan2(Y, X)

Equivalent to tanh/1

atan(X)

Equivalent to tanh/1

atanh(X)

Equivalent to tanh/1

ceil(X)

Equivalent to tanh/1

cos(X)

Equivalent to tanh/1

cosh(X)

Equivalent to tanh/1

erf(X)

Returns the error function of X, where

erfc(X)

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

exp(X)

Equivalent to tanh/1

floor(X)

Equivalent to tanh/1

fmod(X, Y)

Equivalent to tanh/1

log2(X)

Equivalent to tanh/1

log10(X)

Equivalent to tanh/1

log(X)

Equivalent to tanh/1

pi()

Ratio of the circumference of a circle to its diameter.

pow(X, Y)

Equivalent to tanh/1

sin(X)

Equivalent to tanh/1

sinh(X)

Equivalent to tanh/1

sqrt(X)

Equivalent to tanh/1

tan(X)

Equivalent to tanh/1

tanh(X)

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

tau()

Ratio of the circumference of a circle to its radius.

Functions

acos(X)

(since OTP 18.0,OTP 20.0)

-spec acos(X) -> float() when X :: number().

Equivalent to tanh/1

acosh(X)

(since OTP 18.0,OTP 20.0)

-spec acosh(X) -> float() when X :: number().

Equivalent to tanh/1

asin(X)

(since OTP 18.0,OTP 20.0)

-spec asin(X) -> float() when X :: number().

Equivalent to tanh/1

asinh(X)

(since OTP 18.0,OTP 20.0)

-spec asinh(X) -> float() when X :: number().

Equivalent to tanh/1

atan2(Y, X)

(since OTP 18.0,OTP 20.0)

-spec atan2(Y, X) -> float() when Y :: number(), X :: number().

Equivalent to tanh/1

atan(X)

(since OTP 18.0,OTP 20.0)

-spec atan(X) -> float() when X :: number().

Equivalent to tanh/1

atanh(X)

(since OTP 18.0,OTP 20.0)

-spec atanh(X) -> float() when X :: number().

Equivalent to tanh/1

ceil(X)

(since OTP 18.0,OTP 20.0)

-spec ceil(X) -> float() when X :: number().

Equivalent to tanh/1

cos(X)

(since OTP 18.0,OTP 20.0)

-spec cos(X) -> float() when X :: number().

Equivalent to tanh/1

cosh(X)

(since OTP 18.0,OTP 20.0)

-spec cosh(X) -> float() when X :: number().

Equivalent to tanh/1

erf(X)

-spec erf(X) -> float() when 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)

-spec erfc(X) -> float() when X :: number().

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

exp(X)

(since OTP 18.0,OTP 20.0)

-spec exp(X) -> float() when X :: number().

Equivalent to tanh/1

floor(X)

(since OTP 18.0,OTP 20.0)

-spec floor(X) -> float() when X :: number().

Equivalent to tanh/1

fmod(X, Y)

(since OTP 18.0,OTP 20.0)

-spec fmod(X, Y) -> float() when X :: number(), Y :: number().

Equivalent to tanh/1

log2(X)

(since OTP 18.0,OTP 20.0)

-spec log2(X) -> float() when X :: number().

Equivalent to tanh/1

log10(X)

(since OTP 18.0,OTP 20.0)

-spec log10(X) -> float() when X :: number().

Equivalent to tanh/1

log(X)

(since OTP 18.0,OTP 20.0)

-spec log(X) -> float() when X :: number().

Equivalent to tanh/1

pi()

-spec pi() -> float().

Ratio of the circumference of a circle to its diameter.

Floating point approximation of mathematical constant pi.

pow(X, Y)

(since OTP 18.0,OTP 20.0)

-spec pow(X, Y) -> float() when X :: number(), Y :: number().

Equivalent to tanh/1

sin(X)

(since OTP 18.0,OTP 20.0)

-spec sin(X) -> float() when X :: number().

Equivalent to tanh/1

sinh(X)

(since OTP 18.0,OTP 20.0)

-spec sinh(X) -> float() when X :: number().

Equivalent to tanh/1

sqrt(X)

(since OTP 18.0,OTP 20.0)

-spec sqrt(X) -> float() when X :: number().

Equivalent to tanh/1

tan(X)

(since OTP 18.0,OTP 20.0)

-spec tan(X) -> float() when X :: number().

Equivalent to tanh/1

tanh(X)

(since OTP 18.0,OTP 20.0)

-spec tanh(X) -> float() when X :: number().

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

tau()

(since OTP 26.0)

-spec 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().