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<a name="Functions-and-Variables-for-Strings"></a>
<div class="header">
<p>
Previous: <a href="maxima_15.html#Introduction-to-Strings" accesskey="p" rel="previous">Introduction to Strings</a>, Up: <a href="maxima_14.html#Strings" accesskey="u" rel="up">Strings</a> [<a href="maxima_toc.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="maxima_423.html#Function-and-Variable-Index" title="Index" rel="index">Index</a>]</p>
</div>
<a name="Functions-and-Variables-for-Strings-1"></a>
<h4 class="subsection">5.2.2 Functions and Variables for Strings</h4>
<a name="concat"></a><a name="Item_003a-DataTypes_002fdeffn_002fconcat"></a><dl>
<dt><a name="index-concat"></a>Function: <strong>concat</strong> <em>(<var>arg_1</var>, <var>arg_2</var>, …)</em></dt>
<dd>
<p>Concatenates its arguments. The arguments must evaluate to atoms. The return
value is a symbol if the first argument is a symbol and a string otherwise.
</p>
<p><code>concat</code> evaluates its arguments. The single quote <code>'</code> prevents
evaluation.
</p>
<p>See also <code><a href="#sconcat">sconcat</a></code>, that works on non-atoms, too, <code><a href="maxima_378.html#simplode">simplode</a></code>,
<code><a href="#string">string</a></code> and <code><a href="maxima_378.html#eval_005fstring">eval_string</a></code>.
For complex string conversions see also <code><a href="maxima_376.html#printf">printf</a></code>.
</p>
<div class="example">
<pre class="example">(%i1) y: 7$
(%i2) z: 88$
(%i3) concat (y, z/2);
(%o3) 744
(%i4) concat ('y, z/2);
(%o4) y44
</pre></div>
<p>A symbol constructed by <code>concat</code> may be assigned a value and appear in
expressions. The <code><a href="maxima_40.html#g_t_003a_003a">::</a></code> (double colon) assignment operator evaluates its
left-hand side.
</p>
<div class="example">
<pre class="example">(%i5) a: concat ('y, z/2);
(%o5) y44
(%i6) a:: 123;
(%o6) 123
(%i7) y44;
(%o7) 123
(%i8) b^a;
y44
(%o8) b
(%i9) %, numer;
123
(%o9) b
</pre></div>
<p>Note that although <code>concat (1, 2)</code> looks like a number, it is a string.
</p>
<div class="example">
<pre class="example">(%i10) concat (1, 2) + 3;
(%o10) 12 + 3
</pre></div>
<div class=categorybox>
Categories:<a href="maxima_424.html#Category_003a-Expressions">Expressions</a>
·<a href="maxima_424.html#Category_003a-Strings">Strings</a>
·</div></dd></dl>
<a name="sconcat"></a><a name="Item_003a-DataTypes_002fdeffn_002fsconcat"></a><dl>
<dt><a name="index-sconcat"></a>Function: <strong>sconcat</strong> <em>(<var>arg_1</var>, <var>arg_2</var>, …)</em></dt>
<dd>
<p>Concatenates its arguments into a string. Unlike <code><a href="#concat">concat</a></code>, the
arguments do <i>not</i> need to be atoms.
</p>
<p>See also <code><a href="#concat">concat</a></code>, <code><a href="maxima_378.html#simplode">simplode</a></code>, <code><a href="#string">string</a></code> and <code><a href="maxima_378.html#eval_005fstring">eval_string</a></code>.
For complex string conversions see also <code><a href="maxima_376.html#printf">printf</a></code>.
</p>
<div class="example">
<pre class="example">(%i1) sconcat ("xx[", 3, "]:", expand ((x+y)^3));
(%o1) xx[3]:y^3+3*x*y^2+3*x^2*y+x^3
</pre></div>
<p>Another purpose for <code>sconcat</code> is to convert arbitrary objects to strings.
</p><div class="example">
<pre class="example">(%i1) sconcat (x);
(%o1) x
</pre><pre class="example">(%i2) stringp(%);
(%o2) true
</pre></div>
<div class=categorybox>
Categories:<a href="maxima_424.html#Category_003a-Expressions">Expressions</a>
·<a href="maxima_424.html#Category_003a-Strings">Strings</a>
·</div></dd></dl>
<a name="string"></a><a name="Item_003a-DataTypes_002fdeffn_002fstring"></a><dl>
<dt><a name="index-string"></a>Function: <strong>string</strong> <em>(<var>expr</var>)</em></dt>
<dd>
<p>Converts <code>expr</code> to Maxima’s linear notation just as if it had been typed
in.
</p>
<p>The return value of <code>string</code> is a string, and thus it cannot be used in a
computation.
</p>
<p>See also <code><a href="#concat">concat</a></code>, <code><a href="#sconcat">sconcat</a></code>, <code><a href="maxima_378.html#simplode">simplode</a></code> and
<code><a href="maxima_378.html#eval_005fstring">eval_string</a></code>.
</p>
<div class=categorybox>
Categories:<a href="maxima_424.html#Category_003a-Strings">Strings</a>
·</div></dd></dl>
<a name="stringdisp"></a><a name="Item_003a-DataTypes_002fdefvr_002fstringdisp"></a><dl>
<dt><a name="index-stringdisp"></a>Option variable: <strong>stringdisp</strong></dt>
<dd><p>Default value: <code>false</code>
</p>
<p>When <code>stringdisp</code> is <code>true</code>, strings are displayed enclosed in double
quote marks. Otherwise, quote marks are not displayed.
</p>
<p><code>stringdisp</code> is always <code>true</code> when displaying a function definition.
</p>
<p>Examples:
</p>
<div class="example">
<pre class="example">(%i1) stringdisp: false$
</pre><pre class="example">(%i2) "This is an example string.";
(%o2) This is an example string.
</pre><pre class="example">(%i3) foo () :=
print ("This is a string in a function definition.");
(%o3) foo() :=
print("This is a string in a function definition.")
</pre><pre class="example">(%i4) stringdisp: true$
</pre><pre class="example">(%i5) "This is an example string.";
(%o5) "This is an example string."
</pre></div>
<div class=categorybox>
Categories:<a href="maxima_424.html#Category_003a-Display-flags-and-variables">Display flags and variables</a>
·</div></dd></dl>
<a name="Item_003a-Constants_002fnode_002fConstants"></a><hr>
<div class="header">
<p>
Previous: <a href="maxima_15.html#Introduction-to-Strings" accesskey="p" rel="previous">Introduction to Strings</a>, Up: <a href="maxima_14.html#Strings" accesskey="u" rel="up">Strings</a> [<a href="maxima_toc.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="maxima_423.html#Function-and-Variable-Index" title="Index" rel="index">Index</a>]</p>
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