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<h2>
<span class="refentrytitle">tab</span>
</h2>
<p>tab —
Fast table opcodes.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp47178224"></a>
<h2>Description</h2>
<p>
Fast table opcodes. Faster than
<a class="link" href="table.html" title="table"><em class="citetitle">table</em></a> and
<a class="link" href="tablew.html" title="tablew"><em class="citetitle">tablew</em></a> because don't
allow wrap-around and limit and don't check index validity. Have
been implemented in order to provide fast access to
arrays. Support non-power of two tables (can be generated by any
GEN function by giving a negative length value).
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp47180080"></a>
<h2>Syntax</h2>
<pre class="synopsis">ir <span class="command"><strong>tab_i</strong></span> indx, ifn[, ixmode]</pre>
<pre class="synopsis">kr <span class="command"><strong>tab</strong></span> kndx, ifn[, ixmode]</pre>
<pre class="synopsis">ar <span class="command"><strong>tab</strong></span> xndx, ifn[, ixmode]</pre>
<pre class="synopsis"><span class="command"><strong>tabw_i</strong></span> isig, indx, ifn [,ixmode]</pre>
<pre class="synopsis"><span class="command"><strong>tabw</strong></span> ksig, kndx, ifn [,ixmode]</pre>
<pre class="synopsis"><span class="command"><strong>tabw</strong></span> asig, andx, ifn [,ixmode]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp47184528"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ifn</em></span> -- table number
</p>
<p>
<span class="emphasis"><em>ixmode</em></span> -- defaults to zero. If zero
<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.
</p>
<p>
<span class="emphasis"><em>isig</em></span> -- input value to write.
</p>
<p>
<span class="emphasis"><em>indx</em></span> -- table index
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp47187632"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>asig, ksig</em></span> -- input signal to write.
</p>
<p>
<span class="emphasis"><em>andx, kndx</em></span> -- table index.
</p>
<p>
<span class="emphasis"><em>tab</em></span> and <span class="emphasis"><em>tabw</em></span>
opcodes are similar to <span class="emphasis"><em>table</em></span> and
<span class="emphasis"><em>tablew</em></span>, but are faster and support tables
having non-power-of-two length.
</p>
<p>
Special care of index value must be taken into account. Index
values out of the table allocated space will crash Csound.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp47190408"></a>
<h2>Examples</h2>
<p>
Here is an example of the tab opcode. It uses the file <a class="ulink" href="examples/tab.csd" target="_top"><em class="citetitle">tab.csd</em></a>.
</p>
<div class="example">
<a id="idp47191376"></a>
<p class="title">
<strong>Example 846. Example of the tab 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 realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o tab.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
gifn1 <span class="ohdr">ftgen</span> 1, 0, 0, 1, "flute.aiff", 0, 4, 0 <span class="comment">;deferred-size table</span>
<span class="oblock">instr</span> 1
atab <span class="opc">init</span> 0
isize <span class="opc">tableng</span> 1 <span class="comment">;length of table?</span>
<span class="opc">print</span> isize
andx <span class="opc">phasor</span> 1 <span class="op">/</span> (isize <span class="op">/</span> sr)
asig <span class="opc">tab</span> andx, 1, 1 <span class="comment">;has a 0 to 1 range</span>
<span class="opc">outs</span> asig, asig
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 2.3
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
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<div class="refsect1" title="Credits">
<a id="idp47193640"></a>
<h2>Credits</h2>
<p>Written by Gabriel Maldonado.</p>
</div>
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