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<H1>math</H1>
</CENTER>
<H3>MODULE</H3>
<DIV CLASS=REFBODY>
math
</DIV>
<H3>MODULE SUMMARY</H3>
<DIV CLASS=REFBODY>
Mathematical Functions
</DIV>
<H3>DESCRIPTION</H3>
<DIV CLASS=REFBODY>
<P>This module provides an interface to a number of mathematical
functions.
<P>
<TABLE CELLPADDING=4>
<TR>
<TD VALIGN=TOP><IMG ALT="Note!" SRC="note.gif"></TD>
<TD>
<P>Not all functions are implemented on all platforms. In particular,
the <CODE>erf/1</CODE> and <CODE>erfc/1</CODE> functions are not implemented on Windows. </TD>
</TR>
</TABLE>
</DIV>
<H3>EXPORTS</H3>
<P><A NAME="pi/0"><STRONG><CODE>pi() -> float()</CODE></STRONG></A><BR>
<DIV CLASS=REFBODY>
<P>A useful number.
</DIV>
<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>
<DIV CLASS=REFBODY><P>Types:
<DIV CLASS=REFTYPES>
<P>
<STRONG><CODE>X = Y = number()</CODE></STRONG><BR>
</DIV>
</DIV>
<DIV CLASS=REFBODY>
<P>A collection of math functions which return floats. Arguments
are numbers.
</DIV>
<P><A NAME="erf/1"><STRONG><CODE>erf(X) -> float()</CODE></STRONG></A><BR>
<DIV CLASS=REFBODY><P>Types:
<DIV CLASS=REFTYPES>
<P>
<STRONG><CODE>X = number()</CODE></STRONG><BR>
</DIV>
</DIV>
<DIV CLASS=REFBODY>
<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>
</DIV>
<P><A NAME="erfc/1"><STRONG><CODE>erfc(X) -> float()</CODE></STRONG></A><BR>
<DIV CLASS=REFBODY><P>Types:
<DIV CLASS=REFTYPES>
<P>
<STRONG><CODE>X = number()</CODE></STRONG><BR>
</DIV>
</DIV>
<DIV CLASS=REFBODY>
<P><CODE>erfc(X)</CODE> returns <CODE>1.0 - erf(X)</CODE>, computed by
methods that avoid cancellation for large <CODE>X</CODE>.
</DIV>
<H3>Bugs</H3>
<DIV CLASS=REFBODY>
<P>As these are the C library, the bugs are the same.
</DIV>
<H3>AUTHORS</H3>
<DIV CLASS=REFBODY>
Mike Williams - support@erlang.ericsson.se<BR>
</DIV>
<CENTER>
<HR>
<SMALL>stdlib 1.14.2<BR>
Copyright © 1991-2006
<A HREF="http://www.erlang.se">Ericsson AB</A><BR>
</SMALL>
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