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Isotropic Cartesian Matching
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<h4><a name="IsotropicCartesianMatchEngine">7.1.6 <code>1d</code>, <code>2d</code>, ...:
Isotropic Cartesian Matching</a></h4>
<p><pre>matcher=1d values*='<x>'
params='<error>'
tuning='<bin-factor>'</pre>
<blockquote>
<dl>
<dt><strong><code>values*</code>:</strong></dt>
<dd>
<ul>
<li><code>x</code>: Cartesian co-ordinate #1
</li>
</ul>
</dd>
<dt><strong><code>params</code>:</strong></dt>
<dd>
<ul>
<li><code>error</code>: Maximum Cartesian separation for match
</li>
</ul>
</dd>
<dt><strong><code>tuning</code>:</strong></dt>
<dd>
<ul>
<li><code>bin-factor</code>: Scaling factor to adjust bin size; larger values mean larger bins
</li>
</ul>
</dd>
</dl>
</blockquote>
</p>
<p><pre>matcher=2d values*='<x> <y>'
params='<error>'
tuning='<bin-factor>'</pre>
<blockquote>
<dl>
<dt><strong><code>values*</code>:</strong></dt>
<dd>
<ul>
<li><code>x</code>: Cartesian co-ordinate #1
</li>
<li><code>y</code>: Cartesian co-ordinate #2
</li>
</ul>
</dd>
<dt><strong><code>params</code>:</strong></dt>
<dd>
<ul>
<li><code>error</code>: Maximum Cartesian separation for match
</li>
</ul>
</dd>
<dt><strong><code>tuning</code>:</strong></dt>
<dd>
<ul>
<li><code>bin-factor</code>: Scaling factor to adjust bin size; larger values mean larger bins
</li>
</ul>
</dd>
</dl>
</blockquote>
</p>
<p>The <code>1d</code> matcher compares positions in 1-dimensional
Cartesian space.
Rows are considered to match if their <code>x</code> column
values differ by no more than <code>error</code>.
</p>
<p>The <code>2d</code> matcher compares postions in 2-dimensional
Cartesian space.
Rows are considered to match if the difference in their
(<code>x</code>,<code>y</code>) positions reckoned using
Pythagoras is less than <code>error</code>.
</p>
<p>Matching in any number of Cartesian dimensions can be done by
extending this syntax in the obvious way.
</p>
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<hr><i>STILTS - Starlink Tables Infrastructure Library Tool Set<br>Starlink User Note256<br>STILTS web page:
<a href="http://www.starlink.ac.uk/stilts/">http://www.starlink.ac.uk/stilts/</a><br>Author email:
<a href="mailto:m.b.taylor@bristol.ac.uk">m.b.taylor@bristol.ac.uk</a><br>Mailing list:
<a href="mailto:topcat-user@jiscmail.ac.uk">topcat-user@jiscmail.ac.uk</a><br></i></body>
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