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<refentry id="printk2">
<indexterm id="IndexPrintk2"><primary>printk2</primary></indexterm>
<refentryinfo><title>Signal I/O:Printing and Display</title></refentryinfo>
<refmeta>
<refentrytitle>printk2</refentrytitle>
</refmeta>
<refnamediv>
<refname>printk2</refname>
<refpurpose>
Prints a new value every time a control variable changes.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
Prints a new value every time a control variable changes.
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis><command>printk2</command> kvar [, inumspaces]</synopsis>
</refsect1>
<refsect1>
<title>Initialization</title>
<para>
<emphasis>inumspaces</emphasis> (optional, default=0) -- number of space characters printed before the value of <emphasis>kvar</emphasis>
</para>
</refsect1>
<refsect1>
<title>Performance</title>
<para>
<emphasis>kvar</emphasis> -- signal to be printed
</para>
<para>
Derived from Robin Whittle's <emphasis>printk</emphasis>, prints a new value of <emphasis>kvar</emphasis> each time <emphasis>kvar</emphasis> changes. Useful for monitoring MIDI control changes when using sliders.
</para>
<warning>
<para>
<emphasis>WARNING!</emphasis> Don't use this opcode with normal, continuously variant k-signals, because it can hang the computer, as the rate of printing is too fast.
</para>
</warning>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
Here is an example of the printk2 opcode. It uses the file <ulink url="examples/printk2.csd"><citetitle>printk2.csd</citetitle></ulink>.
<example>
<title>Example of the printk2 opcode.</title>
<para>See the sections <link linkend="UsingRealTime"><citetitle>Real-time Audio</citetitle></link> and <link linkend="CommandFlags"><citetitle>Command Line Flags</citetitle></link> for more information on using command line flags.</para>
<xi:include href="examples-xml/printk2.csd.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
</example>
Its output should include lines like these:
<screen>
i1 0.00000
i1 3.00000
i1 1.00000
i1 3.00000
i1 1.00000
i1 2.00000
i1 3.00000
.....
</screen>
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<link linkend="printk"><citetitle>printk</citetitle></link> and
<link linkend="printks"><citetitle>printks</citetitle></link>
</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>
<simplelist>
<member>Author: &namegabriel;</member>
<member>Italy</member>
<member>1998</member>
</simplelist>
</para>
<para>New in Csound version 3.48</para>
</refsect1>
</refentry>
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