.TH math 3erl "stdlib 1.18.1" "Ericsson AB" "Erlang Module Definition"
.SH NAME
math \- Mathematical Functions
.SH DESCRIPTION
.LP
This module provides an interface to a number of mathematical functions\&.
.LP

.RS -4
.B
Note:
.RE
Not all functions are implemented on all platforms\&. In particular, the \fIerf/1\fR\& and \fIerfc/1\fR\& functions are not implemented on Windows\&.

.SH EXPORTS
.LP
.nf

.B
pi() -> float()
.br
.fi
.br
.RS
.LP
A useful number\&.
.RE

.LP
.B
sin(X)
.br
.B
cos(X)
.br
.B
tan(X)
.br
.B
asin(X)
.br
.B
acos(X)
.br
.B
atan(X)
.br
.B
atan2(Y, X)
.br
.B
sinh(X)
.br
.B
cosh(X)
.br
.B
tanh(X)
.br
.B
asinh(X)
.br
.B
acosh(X)
.br
.B
atanh(X)
.br
.B
exp(X)
.br
.B
log(X)
.br
.B
log10(X)
.br
.B
pow(X, Y)
.br
.B
sqrt(X)
.br
.RS
.LP
Types:

.RS 3
X = Y = number()
.br
.RE
.RE
.RS
.LP
A collection of math functions which return floats\&. Arguments are numbers\&.
.RE

.LP
.B
erf(X) -> float()
.br
.RS
.LP
Types:

.RS 3
X = number()
.br
.RE
.RE
.RS
.LP
Returns the error function of \fIX\fR\&, where
.LP
.nf

erf(X) = 2/sqrt(pi)*integral from 0 to X of exp(-t*t) dt.        
.fi
.RE

.LP
.B
erfc(X) -> float()
.br
.RS
.LP
Types:

.RS 3
X = number()
.br
.RE
.RE
.RS
.LP
\fIerfc(X)\fR\& returns \fI1\&.0 - erf(X)\fR\&, computed by methods that avoid cancellation for large \fIX\fR\&\&.
.RE

.SH "BUGS"

.LP
As these are the C library, the bugs are the same\&.