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<p>
<a name="The-set-command"></a>
Next: <a rel="next" accesskey="n" href="The-override-command.de.html#The-override-command">The override command</a>,
Previous: <a rel="previous" accesskey="p" href="Overview-of-modifying-properties.de.html#Overview-of-modifying-properties">Overview of modifying properties</a>,
Up: <a rel="up" accesskey="u" href="Modifying-properties.de.html#Modifying-properties">Modifying properties</a>
<hr>
</div>
<h4 class="subsection">5.3.2 The <code>\set</code> command</h4>
<p><a name="index-properties-2683"></a><a name="index-g_t_005cset-2684"></a><a name="index-g_t_005cset-2685"></a>
<a name="index-changing-properties-2686"></a>
Each context can have different <em>properties</em>, variables contained
in that context. They can be changed during the interpretation step.
This is achieved by inserting the <code>\set</code> command in the music,
<pre class="example">\set <var>context</var>.<var>prop</var> = #<var>value</var>
</pre>
<p>For example,
<blockquote>
<pre class="verbatim">
R1*2
\set Score.skipBars = ##t
R1*2
</pre>
<p>
<a href="../e9/lily-798ce3d9.ly">
<img align="middle"
border="0" src="../e9/lily-798ce3d9.png" alt="[image of music]">
</a>
</p>
</blockquote>
<p>This command skips measures that have no notes. The result is that
multi-rests are condensed. The value assigned is a Scheme object. In
this case, it is <code>#t</code>, the boolean True value.
<p>If the <var>context</var> argument is left out, then the current bottom-most
context (typically <code>ChordNames</code>, <code>Voice</code>, or
<code>Lyrics</code>) is used. In this example,
<blockquote>
<pre class="verbatim">
c8 c c c
\set autoBeaming = ##f
c8 c c c
</pre>
<p>
<a href="../db/lily-c1dd1c9a.ly">
<img align="middle"
border="0" src="../db/lily-c1dd1c9a.png" alt="[image of music]">
</a>
</p>
</blockquote>
<p class="noindent">the <var>context</var> argument to <code>\set</code> is left out, so automatic
beaming is switched off in the current <a name="index-Voice-2687"></a><a href="../lilypond-internals/Voice.de.html#Voice">Voice</a>. Note that
the bottom-most context does not always contain the property that you
wish to change – for example, attempting to set the <code>skipBars</code>
property (of the bottom-most context, in this case <code>Voice</code>) will
have no effect.
<blockquote>
<pre class="verbatim">
R1*2
\set skipBars = ##t
R1*2
</pre>
<p>
<a href="../e7/lily-6ed882bb.ly">
<img align="middle"
border="0" src="../e7/lily-6ed882bb.png" alt="[image of music]">
</a>
</p>
</blockquote>
<p>Contexts are hierarchical, so if a bigger context was specified, for
example <code>Staff</code>, then the change would also apply to all
<code>Voice</code>s in the current stave. The change is applied
‘on-the-fly’, during the music, so that the setting only affects the
second group of eighth notes.
<p><a name="index-g_t_005cunset-2688"></a><a name="index-g_t_005cunset-2689"></a>
<p>There is also an <code>\unset</code> command,
<pre class="example">\unset <var>context</var>.<var>prop</var>
</pre>
<p class="noindent">which removes the definition of <var>prop</var>. This command removes
the definition only if it is set in <var>context</var>, so
<pre class="example">\set Staff.autoBeaming = ##f
</pre>
<p class="noindent">introduces a property setting at <code>Staff</code> level. The setting also
applies to the current <code>Voice</code>. However,
<pre class="example">\unset Voice.autoBeaming
</pre>
<p class="noindent">does not have any effect. To cancel this setting, the <code>\unset</code>
must be specified on the same level as the original <code>\set</code>. In
other words, undoing the effect of <code>Staff.autoBeaming = ##f</code>
requires
<pre class="example">\unset Staff.autoBeaming
</pre>
<p>Like <code>\set</code>, the <var>context</var> argument does not have to be
specified for a bottom context, so the two statements
<pre class="example">\set Voice.autoBeaming = ##t
\set autoBeaming = ##t
</pre>
<p class="noindent">are equivalent.
<p><a name="index-g_t_005conce-2690"></a>Settings that should only apply to a single time-step can be entered
with <code>\once</code>, for example in
<blockquote>
<pre class="verbatim">
c4
\once \set fontSize = #4.7
c4
c4
</pre>
<p>
<a href="../c9/lily-23b8cd12.ly">
<img align="middle"
border="0" src="../c9/lily-23b8cd12.png" alt="[image of music]">
</a>
</p>
</blockquote>
<p>the property <code>fontSize</code> is unset automatically after the second
note.
<p>A full description of all available context properties is in the
program reference, see
<a name="index-Tunable-context-properties-2691"></a><a href="../lilypond-internals/Tunable-context-properties.de.html#Tunable-context-properties">Tunable context properties</a>.
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