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<h2>
<span class="refentrytitle">pindex</span>
</h2>
<p>pindex —
Returns the value of a specified pfield.
</p>
</div>
<div class="refsect1">
<a id="idm281472903700216"></a>
<h2>Description</h2>
<p>
<span class="emphasis"><em>pindex</em></span> returns the value of a specified pfield.
</p>
</div>
<div class="refsect1">
<a id="idm281472903698472"></a>
<h2>Syntax</h2>
<pre class="synopsis">ivalue <span class="command"><strong>pindex</strong></span> ipfieldIndex</pre>
</div>
<div class="refsect1">
<a id="idm281472903638056"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ipfieldIndex</em></span> - pfield number to query.
</p>
<p>
<span class="emphasis"><em>ivalue</em></span> - value of the pfield.
</p>
</div>
<div class="refsect1">
<a id="idm281472903635208"></a>
<h2>Examples</h2>
<p>
Here is an example of the pindex opcode. It uses the file <a class="ulink" href="examples/pindex.csd" target="_top"><em class="citetitle">pindex.csd</em></a>.
</p>
<div class="example">
<a id="idm281472903633352"></a>
<p class="title">
<strong>Example 692. Example of the pindex 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="idm281472725196376"></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>
<span class="c1">; Audio out Audio in No messages MIDI in</span>
-odac -iadc <span class="c1">; -d -M0 ;;;RT audio I/O with MIDI in</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">;-o pindex.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="c1">;Example by Anthony Kozar Dec 2006</span>
<span class="kd">instr</span> <span class="nf">1</span>
i<span class="n">num</span> <span class="nb">pcount</span>
i<span class="n">ndex</span> <span class="nb">init</span> <span class="mi">1</span>
<span class="nl">loop1</span><span class="p">:</span>
i<span class="n">value</span> <span class="nb">pindex</span> i<span class="n">ndex</span>
<span class="nb">printf_i</span> <span class="s">"p</span><span class="si">%d</span><span class="s"> = %f</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> i<span class="n">ndex</span><span class="p">,</span> i<span class="n">value</span>
i<span class="n">ndex</span> <span class="o">=</span> i<span class="n">ndex</span> <span class="o">+</span> <span class="mi">1</span>
<span class="k">if</span> <span class="p">(</span>i<span class="n">ndex</span> <span class="o"><=</span> i<span class="n">num</span><span class="p">)</span> <span class="k">igoto</span> <span class="nl">loop1</span>
<span class="nb">print</span> i<span class="n">num</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">3</span> <span class="mi">40</span> <span class="mi">50</span> <span class="c1">; has 5 pfields</span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">1</span> <span class="mi">2</span> <span class="mi">80</span> <span class="c1">; has 5 due to carry</span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">2</span> <span class="mi">1</span> <span class="mi">40</span> <span class="mi">50</span> <span class="mi">60</span> <span class="mi">70</span> <span class="c1">; has 7</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" />
</p>
<p>
The example will produce the following output:
</p>
<pre class="screen">
new alloc for instr 1:
WARNING: instr 1 uses 3 p-fields but is given 5
p1 = 1.000000
p2 = 0.000000
p3 = 3.000000
p4 = 40.000000
p5 = 50.000000
instr 1: inum = 5.000
B 0.000 .. 1.000 T 1.000 TT 1.000 M: 0.0
new alloc for instr 1:
WARNING: instr 1 uses 3 p-fields but is given 5
p1 = 1.000000
p2 = 1.000000
p3 = 2.000000
p4 = 80.000000
p5 = 50.000000
instr 1: inum = 5.000
B 1.000 .. 2.000 T 2.000 TT 2.000 M: 0.0
new alloc for instr 1:
WARNING: instr 1 uses 3 p-fields but is given 7
p1 = 1.000000
p2 = 2.000000
p3 = 1.000000
p4 = 40.000000
p5 = 50.000000
p6 = 60.000000
p7 = 70.000000
instr 1: inum = 7.000
</pre>
<p>
The warnings can be ignored, because the pfields are used indirectly through pindex instead of explicitly through p4, p5, etc.
</p>
<p>
Here is another example of the pindex opcode. It uses the file <a class="ulink" href="examples/pindex-2.csd" target="_top"><em class="citetitle">pindex-2.csd</em></a>.
</p>
<div class="example">
<a id="idm281472903626040"></a>
<p class="title">
<strong>Example 693. Second example of the pindex opcode.</strong>
</p>
<div class="example-contents">
<div class="refsect1">
<a id="idm281472725081544"></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</span>
<span class="c1">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o pindex-2.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="c1">; This UDO returns a pfield value but returns 0 if it does not exist.</span>
<span class="kd">opcode</span> <span class="nf">mypvalue</span><span class="p">,</span> <span class="kt">i</span><span class="p">,</span> <span class="kt">i</span>
i<span class="n">ndex</span> <span class="nb">xin</span>
i<span class="n">num</span> <span class="nb">pcount</span>
<span class="k">if</span> <span class="p">(</span>i<span class="n">ndex</span> <span class="o">></span> i<span class="n">num</span><span class="p">)</span> <span class="k">then</span>
i<span class="n">out</span> <span class="o">=</span> <span class="mf">0.0</span>
<span class="k">else</span>
i<span class="n">out</span> <span class="nb">pindex</span> i<span class="n">ndex</span>
<span class="k">endif</span>
<span class="nb">xout</span> i<span class="n">out</span>
<span class="kd">endop</span>
<span class="c1">; Envelope UDO that reads parameters from a flexible number of pfields</span>
<span class="c1">; Syntax: kenv flexlinseg ipstart</span>
<span class="c1">; ipstart is the first pfield of the envelope</span>
<span class="c1">; parameters. Reads remaining pfields (up to 21 of them).</span>
<span class="c1">; kenv is the output envelope.</span>
<span class="kd">opcode</span> <span class="nf">flexlinseg</span><span class="p">,</span> <span class="kt">k</span><span class="p">,</span> <span class="kt">i</span>
i<span class="n">pstart</span> <span class="nb">xin</span>
i<span class="n">ep1</span> <span class="nf">mypvalue</span> i<span class="n">pstart</span>
i<span class="n">ep2</span> <span class="nf">mypvalue</span> i<span class="n">pstart</span> <span class="o">+</span> <span class="mi">1</span>
i<span class="n">ep3</span> <span class="nf">mypvalue</span> i<span class="n">pstart</span> <span class="o">+</span> <span class="mi">2</span>
i<span class="n">ep4</span> <span class="nf">mypvalue</span> i<span class="n">pstart</span> <span class="o">+</span> <span class="mi">3</span>
i<span class="n">ep5</span> <span class="nf">mypvalue</span> i<span class="n">pstart</span> <span class="o">+</span> <span class="mi">4</span>
i<span class="n">ep6</span> <span class="nf">mypvalue</span> i<span class="n">pstart</span> <span class="o">+</span> <span class="mi">5</span>
i<span class="n">ep7</span> <span class="nf">mypvalue</span> i<span class="n">pstart</span> <span class="o">+</span> <span class="mi">6</span>
i<span class="n">ep8</span> <span class="nf">mypvalue</span> i<span class="n">pstart</span> <span class="o">+</span> <span class="mi">7</span>
i<span class="n">ep9</span> <span class="nf">mypvalue</span> i<span class="n">pstart</span> <span class="o">+</span> <span class="mi">8</span>
i<span class="n">epa</span> <span class="nf">mypvalue</span> i<span class="n">pstart</span> <span class="o">+</span> <span class="mi">9</span>
i<span class="n">epb</span> <span class="nf">mypvalue</span> i<span class="n">pstart</span> <span class="o">+</span> <span class="mi">10</span>
i<span class="n">epc</span> <span class="nf">mypvalue</span> i<span class="n">pstart</span> <span class="o">+</span> <span class="mi">11</span>
i<span class="n">epd</span> <span class="nf">mypvalue</span> i<span class="n">pstart</span> <span class="o">+</span> <span class="mi">12</span>
i<span class="n">epe</span> <span class="nf">mypvalue</span> i<span class="n">pstart</span> <span class="o">+</span> <span class="mi">13</span>
i<span class="n">epf</span> <span class="nf">mypvalue</span> i<span class="n">pstart</span> <span class="o">+</span> <span class="mi">14</span>
i<span class="n">epg</span> <span class="nf">mypvalue</span> i<span class="n">pstart</span> <span class="o">+</span> <span class="mi">15</span>
i<span class="n">eph</span> <span class="nf">mypvalue</span> i<span class="n">pstart</span> <span class="o">+</span> <span class="mi">16</span>
i<span class="n">epi</span> <span class="nf">mypvalue</span> i<span class="n">pstart</span> <span class="o">+</span> <span class="mi">17</span>
i<span class="n">epj</span> <span class="nf">mypvalue</span> i<span class="n">pstart</span> <span class="o">+</span> <span class="mi">18</span>
i<span class="n">epk</span> <span class="nf">mypvalue</span> i<span class="n">pstart</span> <span class="o">+</span> <span class="mi">19</span>
i<span class="n">epl</span> <span class="nf">mypvalue</span> i<span class="n">pstart</span> <span class="o">+</span> <span class="mi">20</span>
k<span class="n">env</span> <span class="nb">linseg</span> i<span class="n">ep1</span><span class="p">,</span> i<span class="n">ep2</span><span class="p">,</span> i<span class="n">ep3</span><span class="p">,</span> i<span class="n">ep4</span><span class="p">,</span> i<span class="n">ep5</span><span class="p">,</span> i<span class="n">ep6</span><span class="p">,</span> i<span class="n">ep7</span><span class="p">,</span> i<span class="n">ep8</span><span class="p">,</span> \
i<span class="n">ep9</span><span class="p">,</span> i<span class="n">epa</span><span class="p">,</span> i<span class="n">epb</span><span class="p">,</span> i<span class="n">epc</span><span class="p">,</span> i<span class="n">epd</span><span class="p">,</span> i<span class="n">epe</span><span class="p">,</span> i<span class="n">epf</span><span class="p">,</span> i<span class="n">epg</span><span class="p">,</span> \
i<span class="n">eph</span><span class="p">,</span> i<span class="n">epi</span><span class="p">,</span> i<span class="n">epj</span><span class="p">,</span> i<span class="n">epk</span><span class="p">,</span> i<span class="n">epl</span>
<span class="nb">xout</span> k<span class="n">env</span>
<span class="kd">endop</span>
<span class="kd">instr</span> <span class="nf">1</span>
<span class="c1">; This instrument only requires 3 pfields but can accept up to 24.</span>
<span class="c1">; (You will still get warnings about more than 3). </span>
k<span class="n">env</span> <span class="nf">flexlinseg</span> <span class="mi">4</span> <span class="c1">; envelope params start at p4</span>
a<span class="n">out</span> <span class="nb">oscili</span> k<span class="n">env</span><span class="o">*</span><span class="mf">.5</span><span class="p">,</span> <span class="mi">256</span><span class="p">,</span> <span class="mi">1</span>
<span class="nb">outs</span> a<span class="n">out</span><span class="p">,</span> a<span class="n">out</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">f</span><span class="mi">1</span> <span class="mi">0</span> <span class="mi">8192</span> <span class="mi">10</span> <span class="mi">1</span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">0</span> <span class="mi">2</span> <span class="mf">0.0</span> <span class="mf">1.0</span> <span class="mf">1.0</span> <span class="mf">1.0</span> <span class="mf">0.0</span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">2</span> <span class="mi">2</span> <span class="mf">0.0</span> <span class="mf">0.1</span> <span class="mf">1.0</span> <span class="mf">1.0</span> <span class="mf">1.0</span> <span class="mf">0.1</span> <span class="mf">0.0</span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">4</span> <span class="mi">2</span> <span class="mf">0.0</span> <span class="mf">0.5</span> <span class="mf">0.0</span> <span class="c1">; one problem is that "missing" pfields carry</span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">6</span> <span class="mi">2</span> <span class="mf">0.0</span> <span class="mf">0.5</span> <span class="mf">0.0</span> <span class="o">!</span> <span class="c1">; now we can fix this problem with !</span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">8</span> <span class="mi">10</span> <span class="mf">0.0</span> <span class="mf">3.0</span> <span class="mf">1.0</span> <span class="mf">0.3</span> <span class="mf">0.1</span> <span class="mf">0.3</span> <span class="mf">1.0</span> <span class="mf">0.3</span> <span class="mf">0.1</span> <span class="mf">0.3</span> <span class="mf">1.0</span> <span class="mf">0.3</span> <span class="mf">0.1</span> <span class="mf">0.8</span> <span class="mf">0.9</span> <span class="mf">5.0</span> <span class="mf">0.0</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" />
</p>
<p>
The example will produce the following output:
</p>
<pre class="screen">
WARNING: instr 1 uses 3 p-fields but is given 8
B 0.000 .. 2.000 T 2.000 TT 2.000 M: 0.49966 0.49966
WARNING: instr 1 uses 3 p-fields but is given 10
B 2.000 .. 4.000 T 4.000 TT 4.000 M: 0.50000 0.50000
WARNING: instr 1 uses 3 p-fields but is given 10
B 4.000 .. 6.000 T 6.000 TT 6.000 M: 0.49943 0.49943
WARNING: instr 1 uses 3 p-fields but is given 6
B 6.000 .. 8.000 T 8.000 TT 8.000 M: 0.00000 0.00000
WARNING: instr 1 uses 3 p-fields but is given 20
B 8.000 .. 18.000 T 18.000 TT 18.000 M: 0.49994 0.49994
</pre>
<p>
</p>
</div>
<div class="refsect1">
<a id="idm281472903621768"></a>
<h2>See Also</h2>
<p>
<a class="link" href="pcount.html" title="pcount"><em class="citetitle">pcount</em></a>
</p>
</div>
<div class="refsect1">
<a id="idm281472903619560"></a>
<h2>Credits</h2>
<p>Example by: Anthony Kozar</p>
<p>Dec. 2006</p>
</div>
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