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Previous: <a href="Tips.html#Tips" accesskey="p" rel="prev">Tips</a>, Up: <a href="Hints.html#Hints" accesskey="u" rel="up">Hints</a> [<a href="Parameter-index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-index.html#Concept-index" title="Index" rel="index">Index</a>]</p>
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<a name="index-Scientific-programming"></a>
<a name="Features-for-scientific-programming"></a>
<h3 class="section">13.3 Features for scientific programming</h3>
<p><small>FWEB</small> contains a few features particularly intended for scientific
programming.
</p>
<ol>
<li> Several built-in functions generate numerical constants. See ‘<samp>$PI</samp>’
(<a href="_0024PI.html#g_t_0024PI">$PI</a>) and ‘<samp>$E</samp>’ (<a href="_0024E.html#g_t_0024E">$E</a>).
</li><li> Several built-in functions perform mathematical manipulations. See
‘<samp>$EXP</samp>’ (<a href="_0024EXP.html#g_t_0024EXP">$EXP</a>), ‘<samp>$POW</samp>’ (<a href="_0024POW.html#g_t_0024POW">$POW</a>), ‘<samp>$SQRT</samp>’
(<a href="_0024SQRT.html#g_t_0024SQRT">$SQRT</a>), ‘<samp>$LOG</samp>’ (<a href="_0024LOG.html#g_t_0024LOG">$LOG</a>), ‘<samp>$LOG10</samp>’ (<a href="_0024LOG10.html#g_t_0024LOG10">$LOG10</a>),
‘<samp>$MAX</samp>’ (<a href="_0024MAX.html#g_t_0024MAX">$MAX</a>), and ‘<samp>$MIN</samp>’ (<a href="_0024MIN.html#g_t_0024MIN">$MIN</a>).
</li><li> The do-loop macro ‘<samp>$DO</samp>’ may be useful. See <a href="_0024DO.html#g_t_0024DO">$DO</a>.
</li><li> C-style array indices can be used by means of the ‘<samp>-n)</samp>’ option.
See <a href="_002dn_0029.html#g_t_002dn_0029">-n)</a>.
</li><li> An active bracket feature helps improve the appearance of
woven code that uses subscripts and/or superscripts heavily. See <a href="_002dW_005b.html#g_t_002dW_005b">-W[</a>.
</li></ol>
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