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<refentry id="tablekt">
<indexterm id="IndexTablekt"><primary>tablekt</primary></indexterm>
<refentryinfo><title>Table Control:Dynamic Selection</title></refentryinfo>
<refmeta>
<refentrytitle>tablekt</refentrytitle>
</refmeta>
<refnamediv>
<refname>tablekt</refname>
<refpurpose>
Provides k-rate control over table numbers.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
k-rate control over table numbers.
</para>
<para>
The standard Csound opcode <link linkend="table"><citetitle>table</citetitle></link> when producing a k- or a-rate result, can only use an init-time variable to select the table number. <emphasis>tablekt</emphasis> accepts k-rate control as well as i-time. In all other respects they are similar to the original opcodes.
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis>ares <command>tablekt</command> xndx, kfn [, ixmode] [, ixoff] [, iwrap]</synopsis>
<synopsis>kres <command>tablekt</command> kndx, kfn [, ixmode] [, ixoff] [, iwrap]</synopsis>
</refsect1>
<refsect1>
<title>Initialization</title>
<para>
<emphasis>ixmode</emphasis> -- if 0, <emphasis>xndx</emphasis> and <emphasis>ixoff</emphasis> ranges match the length of the table. if non-zero <emphasis>xndx</emphasis> and <emphasis>ixoff</emphasis> have a 0 to 1 range. Default is 0
</para>
<para>
<emphasis>ixoff</emphasis> -- if 0, total index is controlled directly by <emphasis>xndx,</emphasis> ie. the indexing starts from the start of the table. If non-zero, start indexing from somewhere else in the table. Value must be positive and less than the table length (<emphasis>ixmode</emphasis> = 0) or less than 1 (<emphasis>ixmode</emphasis> not equal to 0). Default is 0.
</para>
<para>
<emphasis>iwrap</emphasis> -- if <emphasis>iwrap</emphasis> = 0, <emphasis>Limit mode</emphasis>: when total index is below 0, then final index is 0.Total index above table length results in a final index of the table length - high out of range total indexes stick at the upper limit of the table. If <emphasis>iwrap</emphasis> not equal to 0, <emphasis>Wrap mode</emphasis>: total index is wrapped modulo the table length so that all total indexes map into the table. For instance, in a table of length 8, <emphasis>xndx</emphasis> = 5 and <emphasis>ixoff</emphasis> = 6 gives a total index of 11, which wraps to a final index of 3. Default is 0.
</para>
</refsect1>
<refsect1>
<title>Performance</title>
<para>
<emphasis>kndx</emphasis> -- Index into table, either a positive number range matching the table length (<emphasis>ixmode</emphasis> = 0) or a 0 to 1 range (<emphasis>ixmode</emphasis> not equal to 0).
</para>
<para>
<emphasis>xndx</emphasis> -- matching the table length (<emphasis>ixmode</emphasis> = 0) or a 0 to 1 range (<emphasis>ixmode</emphasis> not equal to 0)
</para>
<para>
<emphasis>kfn</emphasis> -- Table number. Must be >= 1. Floats are rounded down to an integer. If a table number does not point to a valid table, or the table has not yet been loaded (<link linkend="GEN01"><citetitle>GEN01</citetitle></link>) then an error will result and the instrument will be de-activated.
</para>
<caution>
<title>Caution with k-rate table numbers</title>
<para>
At k-rate, if a table number of < 1 is given, or the table number points to a non-existent table, or to one which has a length of 0 (it is to be loaded from a file later) then an error will result and the instrument will be deactivated. <emphasis>kfn</emphasis> must be initialized at the appropriate rate using <link linkend="init"><citetitle>init</citetitle></link>. Attempting to load an i-rate value into <emphasis>kfn</emphasis> will result in an error.
</para>
</caution>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
Here is an example of the tablekt opcode. It uses the file <ulink url="examples/tablekt.csd"><citetitle>tablekt.csd</citetitle></ulink>.
<example>
<title>Example of the tablekt 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/tablekt.csd.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
</example>
Its output should include lines like these:
<screen>
i1 2.00000
i1 1.00000
i1 2.00000
i1 1.00000
....
</screen>
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<link linkend="tableikt"><citetitle>tableikt</citetitle></link>
</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>
<simplelist>
<member>Author: Robin Whittle</member>
<member>Australia</member>
<member>May 1997</member>
</simplelist>
</para>
<para>New in version 3.47</para>
</refsect1>
</refentry>
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