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      <h4><a name="replacecol">6.1.23 <code>replacecol</code></a></h4>
      <p><strong>Usage:</strong>
         <pre>   replacecol [-name &lt;name&gt;] [-units &lt;units&gt;] [-ucd &lt;ucd&gt;] [-utype &lt;utype&gt;]
              [-desc &lt;descrip&gt;]
              &lt;col-id&gt; &lt;expr&gt;</pre></p>
      <p>Replaces the content of a column with the value of an
         algebraic expression.
         The old values are discarded in favour of the result of
         evaluating <code>&lt;expr&gt;</code>.
         You can specify the metadata for the new column using the
         <code>-name</code>, <code>-units</code>, <code>-ucd</code>,
         <code>-utype</code>
         and <code>-desc</code> flags; for any of these items which you
         do not specify, they will take the values from the column
         being replaced.
         
      </p>
      <p>It is legal to reference the replaced column in the
         expression,
         so for example "<code>replacecol pixsize pixsize*2</code>"
         just multiplies the values in column <code>pixsize</code> by 2.
         
      </p>
      <p>Syntax for the <a href="col-id.html"><code>&lt;col-id&gt;</code></a>  and <a href="jel.html"><code>&lt;expr&gt;</code></a> arguments is described in the manual.
         
      </p>
      <hr><a href="replaceval.html">Next</a> <a href="repeat.html">Previous</a> <a href="filterSteps.html">Up</a> <a href="index.html">Contents</a> <br> <b>Next: </b><a href="replaceval.html">replaceval</a><br>
       <b>Up: </b><a href="filterSteps.html">Processing Filters</a><br>
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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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