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<TITLE>math</TITLE>
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<H1>math</H1>
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<H3>MODULE</H3>
<UL>
math</UL>
<H3>MODULE SUMMARY</H3>
<UL>
Mathematical Functions</UL>
<H3>DESCRIPTION</H3>
<UL>
<P>This module provides an interface to a number of mathematical
functions.</UL>
<H3>EXPORTS</H3>
<P><A NAME="pi%0"><STRONG><CODE>pi() -> float()</CODE></STRONG></A><BR>
<UL>
<P>A useful number.
</UL>
<P><A NAME="sin%1"><STRONG><CODE>sin(X)</CODE></STRONG></A><BR>
<A NAME="cos%1"><STRONG><CODE>cos(X)</CODE></STRONG></A><BR>
<A NAME="tan%1"><STRONG><CODE>tan(X)</CODE></STRONG></A><BR>
<A NAME="asin%1"><STRONG><CODE>asin(X)</CODE></STRONG></A><BR>
<A NAME="acos%1"><STRONG><CODE>acos(X)</CODE></STRONG></A><BR>
<A NAME="atan%1"><STRONG><CODE>atan(X)</CODE></STRONG></A><BR>
<A NAME="atan2%2"><STRONG><CODE>atan2(Y, X)</CODE></STRONG></A><BR>
<A NAME="sinh%1"><STRONG><CODE>sinh(X)</CODE></STRONG></A><BR>
<A NAME="cosh%1"><STRONG><CODE>cosh(X)</CODE></STRONG></A><BR>
<A NAME="tanh%1"><STRONG><CODE>tanh(X)</CODE></STRONG></A><BR>
<A NAME="asinh%1"><STRONG><CODE>asinh(X)</CODE></STRONG></A><BR>
<A NAME="acosh%1"><STRONG><CODE>acosh(X)</CODE></STRONG></A><BR>
<A NAME="atanh%1"><STRONG><CODE>atanh(X)</CODE></STRONG></A><BR>
<A NAME="exp%1"><STRONG><CODE>exp(X)</CODE></STRONG></A><BR>
<A NAME="log%1"><STRONG><CODE>log(X)</CODE></STRONG></A><BR>
<A NAME="log10%1"><STRONG><CODE>log10(X)</CODE></STRONG></A><BR>
<A NAME="pow%2"><STRONG><CODE>pow(X, Y)</CODE></STRONG></A><BR>
<A NAME="sqrt%1"><STRONG><CODE>sqrt(X)</CODE></STRONG></A><BR>
<P><UL>Types:
<UL>
<STRONG><CODE>X = Y = number()</CODE></STRONG><BR>
</UL>
</UL>
<UL>
<P>A collection of math functions which return floats. Arguments
are numbers.
</UL>
<P><A NAME="erf%1"><STRONG><CODE>erf(X) -> float()</CODE></STRONG></A><BR>
<P><UL>Types:
<UL>
<STRONG><CODE>X = number()</CODE></STRONG><BR>
</UL>
</UL>
<UL>
<P>Returns the error function of <CODE>X</CODE>, where<PRE>erf(X) = 2/sqrt(pi)*integral from 0 to X of exp(-t*t) dt.</PRE>
</UL>
<P><A NAME="erfc%1"><STRONG><CODE>erfc(X) -> float()</CODE></STRONG></A><BR>
<P><UL>Types:
<UL>
<STRONG><CODE>X = number()</CODE></STRONG><BR>
</UL>
</UL>
<UL>
<P><CODE>erfc(X)</CODE> returns <CODE>1.0 - erf(X)</CODE>, computed by
methods that avoid cancellation for large <CODE>X</CODE>.
</UL>
<H3>Bugs</H3>
<UL>
<P>As these are the C library, the bugs are the same.
</UL>
<H3>AUTHORS</H3>
<UL>
Mike Williams - support@erlang.ericsson.se<BR>
</UL>
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<FONT SIZE=-1>stdlib 1.10<BR>
Copyright © 1991-2001
<A HREF="http://www.erlang.se">Ericsson Utvecklings AB</A><BR>
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