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<h4 class="subsection" id="Interpolating-Registers-1">5.8.2 Interpolating Registers</h4>
<a class="index-entry-id" id="index-interpolating-registers-_0028_005cn_0029"></a>
<a class="index-entry-id" id="index-registers_002c-interpolating-_0028_005cn_0029"></a>
<p>Register contents are interpolated with the <code class="code">\n</code> escape sequence.
</p>
<dl class="first-deffn">
<dt class="deffn" id="index-_005cni"><span class="category-def">Escape sequence: </span><span><strong class="def-name"><code class="t">\n</code><span class="r"><i class="slanted">i</i></span><code class="t"></code></strong><a class="copiable-link" href='#index-_005cni'> ¶</a></span></dt>
<dd><a class="index-entry-id" id="index-_005cn"></a>
</dd><dt class="deffnx def-cmd-deffn" id="index-_005cn_0028id"><span class="category-def">Escape sequence: </span><span><strong class="def-name"><code class="t">\n(</code><span class="r"><i class="slanted">id</i></span><code class="t"></code></strong><a class="copiable-link" href='#index-_005cn_0028id'> ¶</a></span></dt>
<dt class="deffnx def-cmd-deffn" id="index-_005cn_005bident_005d"><span class="category-def">Escape sequence: </span><span><strong class="def-name"><code class="t">\n[</code><span class="r"><i class="slanted">ident</i></span><code class="t">]</code></strong><a class="copiable-link" href='#index-_005cn_005bident_005d'> ¶</a></span></dt>
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<a class="index-entry-id" id="index-indirect-assignments"></a>
<a class="index-entry-id" id="index-assignments_002c-indirect"></a>
<p>Interpolate register with name <var class="var">ident</var> (one-character
name <var class="var">i</var>, two-character name <var class="var">id</var>). <code class="code">\n</code> is
interpreted even in copy mode (see <a class="pxref" href="Copy-Mode.html">Copy Mode</a>). If the register is
undefined, it is created and assigned a value of ‘<samp class="samp">0</samp>’, that
value is interpolated, and a warning in category ‘<samp class="samp">reg</samp>’ is emitted.
See <a class="xref" href="Warnings.html">Warnings</a>, for information about the enablement and suppression of
warnings.
</p>
<div class="example">
<div class="group"><pre class="example-preformatted">.nr a 5
.nr as \na+\na
\n(as
⇒ 10
</pre></div></div>
<div class="example">
<div class="group"><pre class="example-preformatted">.nr a1 5
.nr ab 6
.ds str b
.ds num 1
\n[a\n[num]]
⇒ 5
\n[a\*[str]]
⇒ 6
</pre></div></div>
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