# math

### MODULE

math

### MODULE SUMMARY

Mathematical Functions

### DESCRIPTION

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

Note

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

### EXPORTS

pi() -> float()

A useful number.

sin(X)
cos(X)
tan(X)
asin(X)
acos(X)
atan(X)
atan2(Y, X)
sinh(X)
cosh(X)
tanh(X)
asinh(X)
acosh(X)
atanh(X)
exp(X)
log(X)
log10(X)
pow(X, Y)
sqrt(X)

Types:

X = Y = number()

A collection of math functions which 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.

### Bugs

As these are the C library, the bugs are the same.

stdlib 1.15.1
Copyright © 1991-2008 Ericsson AB