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<a name="Introduction-to-alt_002ddisplay"></a>
<div class="header">
<p>
Next: <a href="maxima_182.html#Functions-and-Variables-for-alt_002ddisplay" accesskey="n" rel="next">Functions and Variables for alt-display</a>, Previous: <a href="maxima_180.html#alt_002ddisplay_002dpkg" accesskey="p" rel="previous">alt-display-pkg</a>, Up: <a href="maxima_180.html#alt_002ddisplay_002dpkg" accesskey="u" rel="up">alt-display-pkg</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="Introduction-to-alt_002ddisplay-1"></a>
<h3 class="section">39.1 Introduction to alt-display</h3>
<p>The <em>alt-display</em> package provides a means to change the way that
Maxima displays its output. The <var>*alt-display1d*</var> and
<var>*alt-display2d*</var> Lisp hooks were introduced to Maxima in 2002, but
were not easily accessible from the Maxima REPL until the introduction
of this package.
</p>
<p>The package provides a general purpose function to define alternative
display functions, and a separate function to set the display
function. The package also provides customized display functions to
produce output in TeX, Texinfo, XML and all three output formats
within Texinfo.
</p>
<p>Here is a sample session:
</p>
<div class="example">
<pre class="example">(%i1) load("alt-display.mac")$
(%i2) set_alt_display(2,tex_display)$
(%i3) x/(x^2+y^2) = 1;
\mbox{\tt\red({\it \%o_3}) \black}$${{x}\over{y^2+x^2}}=1$$
(%i4) set_alt_display(2,mathml_display)$
(%i5) x/(x^2+y^2) = 1;
<math xmlns="http://www.w3.org/1998/Math/MathML"> <mi>mlabel</mi>
<mfenced separators=""><msub><mi>%o</mi> <mn>5</mn></msub>
<mo>,</mo><mfrac><mrow><mi>x</mi> </mrow> <mrow><msup><mrow>
<mi>y</mi> </mrow> <mn>2</mn> </msup> <mo>+</mo> <msup><mrow>
<mi>x</mi> </mrow> <mn>2</mn> </msup> </mrow></mfrac> <mo>=</mo>
<mn>1</mn> </mfenced> </math>
(%i6) set_alt_display(2,multi_display_for_texinfo)$
(%i7) x/(x^2+y^2) = 1;
@iftex
@tex
\mbox{\tt\red({\it \%o_7}) \black}$${{x}\over{y^2+x^2}}=1$$
@end tex
@end iftex
@ifhtml
@html
<math xmlns="http://www.w3.org/1998/Math/MathML"> <mi>mlabel</mi>
<mfenced separators=""><msub><mi>%o</mi> <mn>7</mn></msub>
<mo>,</mo><mfrac><mrow><mi>x</mi> </mrow> <mrow><msup><mrow>
<mi>y</mi> </mrow> <mn>2</mn> </msup> <mo>+</mo> <msup><mrow>
<mi>x</mi> </mrow> <mn>2</mn> </msup> </mrow></mfrac> <mo>=</mo>
<mn>1</mn> </mfenced> </math>
@end html
@end ifhtml
@ifinfo
@example
(%o7) x/(y^2+x^2) = 1
@end example
@end ifinfo
</pre></div>
<p>If the alternative display function causes an error, the error is
trapped and the display function is reset to the default display. In the
following example, the <code>error</code> function is set to display the
output. This throws an error, which is handled by resetting the
2d-display to the default.
</p>
<div class="example">
<pre class="example">(%i8) set_alt_display(2,?error)$
(%i9) x;
Error in *alt-display2d*.
Message: Condition designator ((MLABEL) $%O9 $X) is not of type
(OR SYMBOL STRING FUNCTION).
*alt-display2d* reset to nil.
-- an error. To debug this try: debugmode(true);
(%i10) x;
(%o10) x
</pre></div>
<a name="Item_003a-alt_002ddisplay_002fnode_002fFunctions-and-Variables-for-alt_002ddisplay"></a><hr>
<div class="header">
<p>
Next: <a href="maxima_182.html#Functions-and-Variables-for-alt_002ddisplay" accesskey="n" rel="next">Functions and Variables for alt-display</a>, Previous: <a href="maxima_180.html#alt_002ddisplay_002dpkg" accesskey="p" rel="previous">alt-display-pkg</a>, Up: <a href="maxima_180.html#alt_002ddisplay_002dpkg" accesskey="u" rel="up">alt-display-pkg</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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