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<h2>
<span class="refentrytitle">vtaba</span>
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<p>vtaba —
Read vectors (from tables -or arrays of vectors).
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<div class="refsect1" title="Description">
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<h2>Description</h2>
<p>
This opcode reads vectors from tables at a-rate.
</p>
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<div class="refsect1" title="Syntax">
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<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>vtaba</strong></span> andx, ifn, aout1 [, aout2, aout3, .... , aoutN ]</pre>
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<div class="refsect1" title="Initialization">
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<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ifn</em></span> - table number
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<div class="refsect1" title="Performance">
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<h2>Performance</h2>
<p>
<span class="emphasis"><em>andx</em></span> - Index into f-table, either a positive number range matching the table length
</p>
<p>
<span class="emphasis"><em>aout1...aoutN</em></span> - output vector elements
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<p>
This opcode is useful in all cases in which one needs to access sets of values associated to unique indexes (for example, multi-channel samples, STFT bin frames, spectral formants, p-field based scores etc.). The number of elements of each vector (length of the vector) is determined by the number of optional arguments on the right (<span class="emphasis"><em>aout1</em></span>, <span class="emphasis"><em>aout2</em></span>, <span class="emphasis"><em>aout3</em></span>, .... <span class="emphasis"><em>aoutN</em></span>).
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<p>
Notice that no wrap nor limit mode is implemented. So, if an index attempt to access to a zone not allocated by the table, Csound will probably crash. However this drawback can be easily avoided by using wrap or limit opcodes applied to indexes before using <span class="emphasis"><em>vtaba</em></span>, in order to correct eventual out-of-range values.
</p>
<p>
The <span class="command"><strong>vtab</strong></span> family is similar to the <span class="command"><strong>vtable</strong></span> family, but is much faster because interpolation is not available, table number cannot be changed after initialization, and only raw indexing is supported.
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<p>
Notice that <span class="emphasis"><em>vtaba</em></span>'s output arguments are placed at the right of the opcode name, differently from usual (this style is already used in other opcodes using undefined lists of output arguments such as <a class="link" href="fin.html" title="fin"><em class="citetitle">fin</em></a> or <a class="link" href="trigseq.html" title="trigseq"><em class="citetitle">trigseq</em></a>).
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<div class="refsect1" title="Examples">
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<h2>Examples</h2>
<p>
The usage of <span class="emphasis"><em>vtaba</em></span> is similar to <a class="link" href="vtablek.html" title="vtablek"><em class="citetitle">vtablek</em></a>.
</p>
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<div class="refsect1" title="See also">
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<h2>See also</h2>
<p>
<a class="link" href="vtabk.html" title="vtabk"><em class="citetitle">vtabk</em></a>,
<a class="link" href="vtabi.html" title="vtabi"><em class="citetitle">vtabi</em></a>,
<a class="link" href="vtablea.html" title="vtablea"><em class="citetitle">vtablea</em></a>,
<a class="link" href="vtablewa.html" title="vtablewa"><em class="citetitle">vtablewa</em></a>,
<a class="link" href="vtabwa.html" title="vtabwa"><em class="citetitle">vtabwa</em></a>,
</p>
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<div class="refsect1" title="Credits">
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<h2>Credits</h2>
<p>Written by Gabriel Maldonado.</p>
<p>New in Csound 5 (Previously available only on CsoundAV)</p>
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