<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>taninv2</title> <link rel="stylesheet" type="text/css" href="csound.css" /> <link rel="stylesheet" type="text/css" href="syntax-highlighting.css" /> <meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /> <link rel="home" href="index.html" title="The Canonical Csound Reference Manual" /> <link rel="up" href="OpcodesTop.html" title="Orchestra Opcodes and Operators" /> <link rel="prev" href="taninv.html" title="taninv" /> <link rel="next" href="tbvcf.html" title="tbvcf" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">taninv2</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="taninv.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="tbvcf.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry"> <a id="taninv2"></a> <div class="titlepage"></div> <a id="IndexTaninv2" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">taninv2</span> </h2> <p>taninv2 — Returns an arctangent. </p> </div> <div class="refsect1"> <a id="idm281472879297688"></a> <h2>Description</h2> <p> Returns the arctangent of <span class="emphasis"><em>iy/ix</em></span>, <span class="emphasis"><em>ky/kx</em></span>, or <span class="emphasis"><em>ay/ax</em></span>. </p> </div> <div class="refsect1"> <a id="idm281472879295112"></a> <h2>Syntax</h2> <pre class="synopsis">ares <span class="command"><strong>taninv2</strong></span> ay, ax</pre> <pre class="synopsis">ires <span class="command"><strong>taninv2</strong></span> iy, ix</pre> <pre class="synopsis">kres <span class="command"><strong>taninv2</strong></span> ky, kx</pre> <pre class="synopsis">...<span class="command"><strong>taninv2</strong></span>(ky, kx)... (no rate restriction)</pre> <p> Returns the arctangent of <span class="emphasis"><em>iy/ix</em></span>, <span class="emphasis"><em>ky/kx</em></span>, or <span class="emphasis"><em>ay/ax</em></span>. If <span class="emphasis"><em>y</em></span> is zero, <span class="emphasis"><em>taninv2</em></span> returns zero regardless of the value of <span class="emphasis"><em>x</em></span>. If <span class="emphasis"><em>x</em></span> is zero, the return value is: </p> <div class="itemizedlist"> <ul class="itemizedlist" style="list-style-type: disc; "> <li class="listitem"> <p><span class="emphasis"><em>π/2</em></span>, if <span class="emphasis"><em>y</em></span> is positive.</p> </li> <li class="listitem"> <p><span class="emphasis"><em>-π/2</em></span>, if <span class="emphasis"><em>y</em></span> is negative.</p> </li> <li class="listitem"> <p><span class="emphasis"><em>0</em></span>, if <span class="emphasis"><em>y</em></span> is 0.</p> </li> </ul> </div> <p> </p> </div> <div class="refsect1"> <a id="idm281472879217736"></a> <h2>Initialization</h2> <p> <span class="emphasis"><em>iy, ix</em></span> -- values to be converted </p> </div> <div class="refsect1"> <a id="idm281472879216024"></a> <h2>Performance</h2> <p> <span class="emphasis"><em>ky, kx</em></span> -- control rate signals to be converted </p> <p> <span class="emphasis"><em>ay, ax</em></span> -- audio rate signals to be converted </p> </div> <div class="refsect1"> <a id="idm281472879213352"></a> <h2>Examples</h2> <p> Here is an example of the taninv2 opcode. It uses the file <a class="ulink" href="examples/taninv2.csd" target="_top"><em class="citetitle">taninv2.csd</em></a>. </p> <div class="example"> <a id="idm281472879211576"></a> <p class="title"> <strong>Example 999. Example of the taninv2 opcode.</strong> </p> <div class="example-contents"> <p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p> <div class="refsect1"> <a id="idm281472701757848"></a> <pre class="programlisting"> <span class="nt"><CsoundSynthesizer></span> <span class="nt"><CsOptions></span> <span class="c1">; Select audio/midi flags here according to platform</span> <span class="c1">; Audio out Audio in</span> -odac -iadc <span class="c1">;;;RT audio I/O</span> <span class="c1">; For Non-realtime ouput leave only the line below:</span> <span class="c1">; -o taninv2.wav -W ;;; for file output any platform</span> <span class="nt"></CsOptions></span> <span class="nt"><CsInstruments></span> <span class="c1">; Initialize the global variables.</span> <span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span> <span class="vg">kr</span> <span class="o">=</span> <span class="mi">4410</span> <span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">10</span> <span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">1</span> <span class="c1">; Instrument #1.</span> <span class="kd">instr</span> <span class="nf">1</span> <span class="c1">; Returns the arctangent for 1/2.</span> i<span class="n">1</span> <span class="nb">taninv2</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">2</span> <span class="nb">print</span> i<span class="n">1</span> <span class="kd">endin</span> <span class="nt"></CsInstruments></span> <span class="nt"><CsScore></span> <span class="c1">; Play Instrument #1 for one second.</span> <span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">1</span> <span class="nb">e</span> <span class="nt"></CsScore></span> <span class="nt"></CsoundSynthesizer></span> </pre> </div> </div> </div> <p><br class="example-break" /> Its output should include a line like this: </p> <pre class="screen">instr 1: i1 = 0.464</pre> <p> </p> </div> <div class="refsect1"> <a id="idm281472879206616"></a> <h2>See Also</h2> <p> <a class="link" href="taninv.html" title="taninv"><em class="citetitle">taninv</em></a> </p> </div> <div class="refsect1"> <a id="idm281472879204472"></a> <h2>Credits</h2> <p> </p> <table border="0" summary="Simple list" class="simplelist"> <tr> <td>Author: John ffitch</td> </tr> <tr> <td>University of Bath/Codemist Ltd.</td> </tr> <tr> <td>Bath, UK</td> </tr> <tr> <td>April 1998</td> </tr> </table> <p> </p> <p>Example written by Kevin Conder.</p> <p>New in Csound version 3.48</p> <p>Corrected on May 2002, thanks to Istvan Varga.</p> <p>Available as a function in version 6.00</p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="taninv.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="OpcodesTop.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="tbvcf.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">taninv </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> tbvcf</td> </tr> </table> </div> </body> </html>