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<html>
   
   <head>
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      <link rel="stylesheet" type="text/css" href="sun-style.css">
      <title>Usage</title>
   </head>
   
   <body>
      <hr>
      <a href="secB.1.2.html">Next</a> <a href="calc.html">Previous</a> <a href="calc.html">Up</a> <a href="index.html">Contents</a> <br> <b>Next: </b><a href="secB.1.2.html">Examples</a><br>
       <b>Up: </b><a href="calc.html">calc: Evaluates expressions</a><br>
       <b>Previous: </b><a href="calc.html">calc: Evaluates expressions</a><br>
      
      <hr>
      <h3><a name="calc-usage">B.1.1 Usage</a></h3>
      <p>The usage of <code>calc</code> is
         <pre>
   stilts &lt;stilts-flags&gt; calc table=&lt;table&gt;
                              [expression=]&lt;expr&gt;
</pre>
         If you don't have the <code>stilts</code> script installed,
         write "<code>java -jar stilts.jar</code>" instead of
         "<code>stilts</code>" - see <a href="invoke.html">Section 3</a>.
         The available <code>&lt;stilts-flags&gt;</code> are listed
         in <a href="stilts-flags.html">Section 2.1</a>.
         For programmatic invocation, the Task class for this
         command is <code>uk.ac.starlink.ttools.task.Calc</code>.
         
      </p>
      <p>Parameter values are assigned on the command line
         as explained in <a href="task-args.html">Section 2.3</a>.
         They are as follows:
         
      </p>
      <p>
         
         <dl>
            <dt><strong><code>expression = &lt;expr&gt;</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<em>(String)</em></strong></dt>
            <dd>An expression to evaluate.
               The functions in <a href="staticMethods.html">Section 10.5</a> can be used.
               
            </dd>
            <dt><strong><code>table = &lt;table&gt;</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<em>(<a href="http://www.starlink.ac.uk/stil/javadocs/uk/ac/starlink/table/StarTable.html">StarTable</a>)</em></strong></dt>
            <dd>A table which provides the context within which
               <code>expression</code> is evaluated.
               This parameter is optional, and will usually not be required;
               its only purpose is to allow use of constant expressions
               (table parameters) associated with the table.
               These can be referenced using identifiers of the form
               <code>param$*</code>,
               <code>ucd$*</code> or
               <code>utype$*</code> -
               see <a href="jel-paramref.html">Section 10.2</a> for more detail.
               
            </dd>
         </dl>
         
      </p>
      <hr><a href="secB.1.2.html">Next</a> <a href="calc.html">Previous</a> <a href="calc.html">Up</a> <a href="index.html">Contents</a> <br> <b>Next: </b><a href="secB.1.2.html">Examples</a><br>
       <b>Up: </b><a href="calc.html">calc: Evaluates expressions</a><br>
       <b>Previous: </b><a href="calc.html">calc: Evaluates expressions</a><br>
      
      <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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