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<a id="tablekt"></a>
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<h2>
<span class="refentrytitle">tablekt</span>
</h2>
<p>tablekt —
Provides k-rate control over table numbers.
</p>
</div>
<div class="refsect1">
<a id="idm281472881178360"></a>
<h2>Description</h2>
<p>
k-rate control over table numbers.
</p>
<p>
The standard Csound opcode <a class="link" href="table.html" title="table"><em class="citetitle">table</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>tablekt</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">
<a id="idm281472881132216"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>tablekt</strong></span> xndx, kfn [, ixmode] [, ixoff] [, iwrap]</pre>
<pre class="synopsis">kres <span class="command"><strong>tablekt</strong></span> kndx, kfn [, ixmode] [, ixoff] [, iwrap]</pre>
</div>
<div class="refsect1">
<a id="idm281472881128536"></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">
<a id="idm281472881118888"></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" 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>
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</table>
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</div>
<div class="refsect1">
<a id="idm281472881108664"></a>
<h2>Examples</h2>
<p>
Here is an example of the tablekt opcode. It uses the file <a class="ulink" href="examples/tablekt.csd" target="_top"><em class="citetitle">tablekt.csd</em></a>.
</p>
<div class="example">
<a id="idm281472881106888"></a>
<p class="title">
<strong>Example 982. Example of the tablekt 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="idm281472702439528"></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>
-odac <span class="c1">;;;realtime audio out</span>
<span class="c1">;-iadc ;;;uncomment -iadc if RT audio input is needed too</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o tablekt.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">32</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
<span class="nb">seed</span> <span class="mi">0</span>
gi<span class="n">ft1</span> <span class="nb">ftgen</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1024</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">;sine wave</span>
gi<span class="n">ft2</span> <span class="nb">ftgen</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1024</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">;pulse</span>
<span class="kd">instr</span> <span class="nf">1</span>
a<span class="n">ndx</span> <span class="nb">phasor</span> <span class="mi">400</span> <span class="c1">;phasor for reading the index</span>
k<span class="n">fn</span> <span class="nb">init</span> <span class="mi">1</span> <span class="c1">;initialize the choice of the function table</span>
k<span class="n">metro</span> <span class="nb">init</span> <span class="mi">1</span> <span class="c1">;initialize the frequency of the metro</span>
k<span class="n">newft</span> <span class="nb">metro</span> k<span class="n">metro</span> <span class="c1">;make a new choice for selecting the function table once a second</span>
<span class="k">if</span> k<span class="n">newft</span> <span class="o">==</span> <span class="mi">1</span> <span class="k">then</span>
k<span class="n">fn</span> <span class="o">=</span> <span class="p">(</span>k<span class="n">fn</span> <span class="o">==</span> <span class="mi">1</span> <span class="p">?</span> <span class="mi">2</span> <span class="p">:</span> <span class="mi">1</span><span class="p">)</span> <span class="c1">;switch between 1 and 2</span>
k<span class="n">metro</span> <span class="nb">random</span> <span class="mf">.5</span><span class="p">,</span> <span class="mi">2</span> <span class="c1">;create new metro frequency</span>
<span class="nb">printk2</span> k<span class="n">fn</span>
<span class="k">endif</span>
a<span class="n">res</span> <span class="nb">tablekt</span> a<span class="n">ndx</span><span class="p">,</span> k<span class="n">fn</span><span class="p">,</span> <span class="mi">1</span>
<span class="nb">outs</span> a<span class="n">res</span><span class="p">,</span> a<span class="n">res</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">10</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 lines like these:
</p>
<pre class="screen">
i1 2.00000
i1 1.00000
i1 2.00000
i1 1.00000
....
</pre>
<p>
</p>
</div>
<div class="refsect1">
<a id="idm281472881101800"></a>
<h2>See Also</h2>
<p>
<a class="link" href="tableikt.html" title="tableikt"><em class="citetitle">tableikt</em></a>
</p>
</div>
<div class="refsect1">
<a id="idm281472881099720"></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>
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