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<a id="lenarray"></a>
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<a id="IndexLenarray" class="indexterm"></a>
<div class="refnamediv">
<h2>
<span class="refentrytitle">lenarray</span>
</h2>
<p>lenarray —
Evaluates the size or shape length of an array.
</p>
</div>
<div class="refsect1">
<a id="idm281472921241960"></a>
<h2>Description</h2>
<p>
Evaluates the size or number of dimensions of an array.
</p>
</div>
<div class="refsect1">
<a id="idm281472921160888"></a>
<h2>Syntax</h2>
<pre class="synopsis">ir <span class="command"><strong>lenarray</strong></span> karray[, iwhich]</pre>
<pre class="synopsis">kr <span class="command"><strong>lenarray</strong></span> karray[, iwhich]</pre>
</div>
<div class="refsect1">
<a id="idm281472921157368"></a>
<h2>Initialisation</h2>
<p>
<span class="emphasis"><em>karray</em></span> -- The array that is being
questioned. It can be of any dimension.
</p>
<p>
<span class="emphasis"><em>iwhich</em></span> -- selects which dimension to
evaluate the size. If zero or negative it selects the number of
dimensions. It defaults to 1, as used in a vector.
</p>
</div>
<div class="refsect1">
<a id="idm281472921154792"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kr</em></span> -- length of vector.
</p>
<p>
<span class="emphasis"><em>karray</em></span> -- array to query.
</p>
<p>
If the dimension requested is larger than the actual array, or
the array is not initialised the value -1 is returned.
</p>
</div>
<div class="refsect1">
<a id="idm281472921151800"></a>
<h2>Examples</h2>
<p>
Here is an example of the lenarray opcode. It uses the file <a class="ulink" href="examples/lenarray.csd" target="_top"><em class="citetitle">lenarray.csd</em></a>.
</p>
<div class="example">
<a id="idm281472921149944"></a>
<p class="title">
<strong>Example 453. Example of the lenarray 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="idm281472748510152"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
-n -m128 <span class="c1">;no sound output, reduced messages</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="c1">;example by joachim heintz</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">1</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
<span class="kd">instr</span> <span class="nf">1</span> <span class="c1">;simple example</span>
k<span class="n">Arr</span><span class="p">[]</span> <span class="nb">fillarray</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">4</span> <span class="c1">;fill array manually</span>
<span class="nb">printks</span> <span class="s">"Length of kArr = </span><span class="si">%d</span><span class="se">\n\n</span><span class="s">"</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="nb">lenarray</span><span class="p">(</span>k<span class="n">Arr</span><span class="p">)</span> <span class="c1">;print out its length</span>
<span class="nb">turnoff</span> <span class="c1">;only do this in the first k-cycle</span>
<span class="kd">endin</span>
<span class="kd">instr</span> <span class="nf">2</span> <span class="c1">;random array length</span>
i<span class="n">NumEls</span> <span class="nb">random</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">11</span> <span class="c1">;create random number between 1 and 10</span>
k<span class="n">Arr</span><span class="p">[]</span> <span class="nb">init</span> <span class="nb">int</span><span class="p">(</span>i<span class="n">NumEls</span><span class="p">)</span> <span class="c1">;create array of this length</span>
<span class="nb">printks</span> <span class="s">"Random length of kArr = </span><span class="si">%d</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="nb">lenarray</span><span class="p">(</span>k<span class="n">Arr</span><span class="p">)</span> <span class="c1">;print out</span>
<span class="nb">turnoff</span>
<span class="kd">endin</span>
<span class="kd">instr</span> <span class="nf">3</span> <span class="c1">;fill random array length with random elements</span>
i<span class="n">NumEls</span> <span class="nb">random</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">11</span> <span class="c1">;create random number between 1 and 10</span>
k<span class="n">Arr</span><span class="p">[]</span> <span class="nb">init</span> <span class="nb">int</span><span class="p">(</span>i<span class="n">NumEls</span><span class="p">)</span> <span class="c1">;create array of this length</span>
<span class="nb">printks</span> <span class="s">"Random length of kArr = </span><span class="si">%d</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="nb">lenarray</span><span class="p">(</span>k<span class="n">Arr</span><span class="p">)</span> <span class="c1">;print out</span>
<span class="c1">;fill</span>
k<span class="n">Indx</span> <span class="o">=</span> <span class="mi">0</span> <span class="c1">;initialize index</span>
<span class="k">until</span> k<span class="n">Indx</span> <span class="o">==</span> <span class="nb">lenarray</span><span class="p">(</span>k<span class="n">Arr</span><span class="p">)</span> <span class="k">do</span>
k<span class="n">Arr</span><span class="p">[</span>k<span class="n">Indx</span><span class="p">]</span> <span class="nb">rnd31</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">0</span> <span class="c1">;set element to random value -10...10</span>
k<span class="n">Indx</span> <span class="o">+=</span> <span class="mi">1</span> <span class="c1">;increase index</span>
<span class="k">od</span>
<span class="c1">;print</span>
k<span class="n">Indx</span> <span class="o">=</span> <span class="mi">0</span> <span class="c1">;initialize index</span>
<span class="k">until</span> k<span class="n">Indx</span> <span class="o">==</span> <span class="nb">lenarray</span><span class="p">(</span>k<span class="n">Arr</span><span class="p">)</span> <span class="k">do</span>
<span class="nb">printf</span><span class="p">(</span><span class="s">"kArr[</span><span class="si">%d</span><span class="s">] = %f</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> k<span class="n">Indx</span><span class="o">+</span><span class="mi">1</span><span class="p">,</span> k<span class="n">Indx</span><span class="p">,</span> k<span class="n">Arr</span><span class="p">[</span>k<span class="n">Indx</span><span class="p">])</span>
k<span class="n">Indx</span> <span class="o">+=</span> <span class="mi">1</span> <span class="c1">;increase index</span>
<span class="k">od</span>
<span class="nb">turnoff</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="mf">.1</span>
<span class="nb">i</span> <span class="mi">2</span> <span class="mi">0</span> <span class="mf">.1</span>
<span class="nb">i</span> <span class="mi">2</span> <span class="mi">0</span> <span class="mf">.1</span>
<span class="nb">i</span> <span class="mi">3</span> <span class="mi">0</span> <span class="mf">.1</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1">
<a id="idm281472921145656"></a>
<h2>See Also</h2>
<p>
<a class="link" href="vectorial.html" title="Vectorial Opcodes"><em class="citetitle"></em>Vectorial opcodes</a>
</p>
</div>
<div class="refsect1">
<a id="idm281472921143608"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: John ffitch</td>
</tr>
<tr>
<td>Codemist Ltd</td>
</tr>
<tr>
<td>2013</td>
</tr>
</table>
<p>
</p>
<p>New in version 6.00</p>
<p>Extended to multi-dimensions in 6.04</p>
</div>
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