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

math - 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. 


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.

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

stdlib 4.2 Ericsson AB