<?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>tableikt</title>
<link rel="stylesheet" type="text/css" href="csound.css" />
<meta name="generator" content="DocBook XSL Stylesheets V1.76.1" />
<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="tableigpw.html" title="tableigpw" />
<link rel="next" href="tableimix.html" title="tableimix" />
</head>
<body>
<div class="navheader">
<table width="100%" summary="Navigation header">
<tr>
<th colspan="3" align="center">tableikt</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="tableigpw.html">Prev</a> </td>
<th width="60%" align="center">Orchestra Opcodes and Operators</th>
<td width="20%" align="right"> <a accesskey="n" href="tableimix.html">Next</a></td>
</tr>
</table>
<hr />
</div>
<div class="refentry" title="tableikt">
<a id="tableikt"></a>
<div class="titlepage"></div>
<a id="IndexTableikt" class="indexterm"></a>
<div class="refnamediv">
<h2>
<span class="refentrytitle">tableikt</span>
</h2>
<p>tableikt —
Provides k-rate control over table numbers.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp47461360"></a>
<h2>Description</h2>
<p>
k-rate control over table numbers. Function tables are read with linear interpolation.
</p>
<p>
The standard Csound opcode <a class="link" href="tablei.html" title="tablei"><em class="citetitle">tablei</em></a>, when producing a k- or a-rate result, can only use an init-time variable to select the table number. <span class="emphasis"><em>tableikt</em></span> accepts k-rate control as well as i-time. In all other respects they are similar to the original opcodes.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp47516016"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>tableikt</strong></span> xndx, kfn [, ixmode] [, ixoff] [, iwrap]</pre>
<pre class="synopsis">kres <span class="command"><strong>tableikt</strong></span> kndx, kfn [, ixmode] [, ixoff] [, iwrap]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp47517904"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ixmode</em></span> -- if 0, <span class="emphasis"><em>xndx</em></span> and <span class="emphasis"><em>ixoff</em></span> ranges match the length of the table. if non-zero <span class="emphasis"><em>xndx</em></span> and <span class="emphasis"><em>ixoff</em></span> have a 0 to 1 range. Default is 0
</p>
<p>
<span class="emphasis"><em>ixoff</em></span> -- if 0, total index is controlled directly by <span class="emphasis"><em>xndx,</em></span> ie. the indexing starts from the start of the table. If non-zero, start indexing from somewhere else in the table. Value must be positive and less than the table length (<span class="emphasis"><em>ixmode</em></span> = 0) or less than 1 (<span class="emphasis"><em>ixmode</em></span> not equal to 0). Default is 0.
</p>
<p>
<span class="emphasis"><em>iwrap</em></span> -- if <span class="emphasis"><em>iwrap</em></span> = 0, <span class="emphasis"><em>Limit mode</em></span>: when total index is below 0, then final index is 0.Total index above table length results in a final index of the table length - high out of range total indexes stick at the upper limit of the table. If <span class="emphasis"><em>iwrap</em></span> not equal to 0, <span class="emphasis"><em>Wrap mode</em></span>: total index is wrapped modulo the table length so that all total indexes map into the table. For instance, in a table of length 8, <span class="emphasis"><em>xndx</em></span> = 5 and <span class="emphasis"><em>ixoff</em></span> = 6 gives a total index of 11, which wraps to a final index of 3. Default is 0.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp47523208"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kndx</em></span> -- Index into table, either a positive number range matching the table length (<span class="emphasis"><em>ixmode</em></span> = 0) or a 0 to 1 range (<span class="emphasis"><em>ixmode</em></span> not equal to 0).
</p>
<p>
<span class="emphasis"><em>xndx</em></span> -- matching the table length (<span class="emphasis"><em>ixmode</em></span> = 0) or a 0 to 1 range (<span class="emphasis"><em>ixmode</em></span> not equal to 0)
</p>
<p>
<span class="emphasis"><em>kfn</em></span> -- Table number. Must be >= 1. Floats are rounded down to an integer. If a table number does not point to a valid table, or the table has not yet been loaded (<a class="link" href="GEN01.html" title="GEN01"><em class="citetitle">GEN01</em></a>) then an error will result and the instrument will be de-activated.
</p>
<div class="caution" title="Caution with k-rate table numbers" style="margin-left: 0.5in; margin-right: 0.5in;">
<table border="0" summary="Caution: Caution with k-rate table numbers">
<tr>
<td rowspan="2" align="center" valign="top" width="25">
<img alt="[Caution]" src="images/caution.png" />
</td>
<th align="left">Caution with k-rate table numbers</th>
</tr>
<tr>
<td align="left" valign="top">
<p>
At k-rate, if a table number of < 1 is given, or the table number points to a non-existent table, or to one which has a length of 0 (it is to be loaded from a file later) then an error will result and the instrument will be deactivated. <span class="emphasis"><em>kfn</em></span> must be initialized at the appropriate rate using <a class="link" href="init.html" title="init"><em class="citetitle">init</em></a>. Attempting to load an i-rate value into <span class="emphasis"><em>kfn</em></span> will result in an error.
</p>
</td>
</tr>
</table>
</div>
</div>
<div class="refsect1" title="Examples">
<a id="idp47529000"></a>
<h2>Examples</h2>
<p>
Here is an example of the tableikt opcode. It uses the file <a class="ulink" href="examples/tableikt.csd" target="_top"><em class="citetitle">tableikt.csd</em></a>.
</p>
<div class="example">
<a id="idp47529984"></a>
<p class="title">
<strong>Example 852. Example of the tableikt 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>
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
<span class="comment">; Select audio/midi flags here according to platform</span>
-odac <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if RT audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o tableikt.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
<span class="oblock">instr</span> 1
ilowfn <span class="op">=</span> p4 <span class="comment">;lowest ftable wave</span>
ihighfn <span class="op">=</span> p5 <span class="comment">;highest ftable wave</span>
kswpenv <span class="opc">line</span> 1, p3, 0 <span class="comment">;sweep envelope, calculate current table pair and interpolation amount</span>
inumtables <span class="op">=</span> ihighfn <span class="op">-</span> ilowfn <span class="comment">;1 less than number of tables</span>
kfn1 <span class="op">=</span> <span class="opc">int</span>(kswpenv<span class="op">*</span>inumtables) <span class="op">+</span> ilowfn
<span class="opc">printks</span> "play <span class="opc">table</span> no<span class="op">:</span> <span class="op">%</span>d\n", 1, kfn1
kfn2 <span class="op">=</span> kfn1 <span class="op">+</span> 1
kinterp <span class="op">=</span> <span class="opc">frac</span>(kswpenv<span class="op">*</span>inumtables)
ixmode <span class="op">=</span> 1 <span class="comment">;read tables with phasor</span>
aphase <span class="opc">phasor</span> 40
asig <span class="opc">tableikt</span> aphase, kfn1, ixmode <span class="comment">;normalized index</span>
<span class="octrl">if</span> kswpenv <span class="op">==</span> 1.0 <span class="octrl">kgoto</span> skipfn2 <span class="comment">;if kfn1 is last table, there is no kfn2</span>
asig2 <span class="opc">tableikt</span> aphase, kfn2, ixmode
skipfn2<span class="op">:</span>
amix <span class="opc">ntrpol</span> asig, asig2, kinterp <span class="comment">;interpolate between tables and output</span>
<span class="opc">outs</span> amix<span class="op">*</span>.5, amix<span class="op">*</span>.5
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">f</span> 1 0 16384 10 1
<span class="stamnt">f</span> 2 0 16384 10 1 .5
<span class="stamnt">f</span> 3 0 16384 1 "<span class="stamnt">f</span>ox.wav" 0 0 0 <span class="comment">;a sample</span>
<span class="stamnt">f</span> 4 0 16384 10 1 .5 .3 .25 .2 .16 .14 .125 .111 <span class="comment">;sawtooth </span>
<span class="stamnt">f</span> 5 0 16384 10 1 .4 .3 .25 .2
<span class="stamnt">f</span> 6 0 16384 10 1 .3 .3 .25 .2 .16
<span class="stamnt">f</span> 7 0 16384 10 1 1 1 1 .7 .5 .3 .1 <span class="comment">;pulse</span>
<span class="stamnt">f</span> 8 0 16384 1 "beats.wav" 0 0 0 <span class="comment">;a sample</span>
<span class="stamnt">i</span> 1 0 10 1 8
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
Its output should include lines like these:
</p>
<pre class="screen">
play table no: 8
play table no: 7
play table no: 6
.....
play table no: 2
play table no: 1</pre>
<p>
</p>
</div>
<div class="refsect1" title="See Also">
<a id="idp47532736"></a>
<h2>See Also</h2>
<p>
<a class="link" href="tablekt.html" title="tablekt"><em class="citetitle">tablekt</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp47533776"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Robin Whittle</td>
</tr>
<tr>
<td>Australia</td>
</tr>
<tr>
<td>May 1997</td>
</tr>
</table>
<p>
</p>
<p>New in version 3.47</p>
</div>
</div>
<div class="navfooter">
<hr />
<table width="100%" summary="Navigation footer">
<tr>
<td width="40%" align="left"><a accesskey="p" href="tableigpw.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="tableimix.html">Next</a></td>
</tr>
<tr>
<td width="40%" align="left" valign="top">tableigpw </td>
<td width="20%" align="center">
<a accesskey="h" href="index.html">Home</a>
</td>
<td width="40%" align="right" valign="top"> tableimix</td>
</tr>
</table>
</div>
</body>
</html>
distrib
>
Mageia
>
5
>
x86_64
>
media
>
core-release
>
by-pkgid
>
b707d9a4ee443103660a75ccb6e51334
>
files
>
2693
