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Version 1.19.4

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

Types:

Y = X = 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.