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<h3><a name="tloop-usage">B.28.1 Usage</a></h3>
<p>The usage of <code>tloop</code> is
<pre>
stilts <stilts-flags> tloop ocmd=<cmds>
omode=out|meta|stats|count|cgi|discard|topcat|samp|tosql|gui
out=<out-table> ofmt=<out-format>
forcefloat=true|false
[colname=]<value> [start=]<float-value>
[end=]<float-value> [step=]<float-value>
</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><stilts-flags></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.TableLoop</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>colname = <value></code> <em>(String)</em></strong></dt>
<dd>Gives the name of the single column produced by this command.
<p>[Default: <code>i</code>]
</p>
</dd>
<dt><strong><code>end = <float-value></code> <em>(Double)</em></strong></dt>
<dd>Gives the value which the loop variable will not exceed.
Exceeding is in the positive or negative sense according to
the sense of the <code>step</code>
parameter, as usual for a <code>for</code>-type loop.
</dd>
<dt><strong><code>forcefloat = true|false</code> <em>(Boolean)</em></strong></dt>
<dd>Affects the data type of the loop variable column.
If true, the column is always floating point.
If false, and if the other parameters are all of integer type,
the column will be an integer column.
<p>[Default: <code>false</code>]
</p>
</dd>
<dt><strong><code>ocmd = <cmds></code> <em>(<a href="http://andromeda.star.bris.ac.uk/starjavadocs/uk/ac/starlink/ttools/filter/ProcessingStep.html">ProcessingStep[]</a>)</em></strong></dt>
<dd>Specifies processing to be performed on
the output table,
after all other processing has taken place.
The value of this parameter is one or more of the filter
commands described in <a href="filterSteps.html">Section 6.1</a>.
If more than one is given, they must be separated by
semicolon characters (";").
This parameter can be repeated multiple times on the same
command line to build up a list of processing steps.
The sequence of commands given in this way
defines the processing pipeline which is performed on the table.
<p>Commands may alteratively be supplied in an external file,
by using the indirection character '@'.
Thus a value of "<code>@filename</code>"
causes the file <code>filename</code> to be read for a list
of filter commands to execute. The commands in the file
may be separated by newline characters and/or semicolons.
</p>
</dd>
<dt><strong><code>ofmt = <out-format></code> <em>(String)</em></strong></dt>
<dd>Specifies the format in which the output table will be written
(one of the ones in <a href="outFormats.html">Section 5.2.2</a> - matching is
case-insensitive and you can use just the first few letters).
If it has the special value
"<code>(auto)</code>"
(the default),
then the output filename will be
examined to try to guess what sort of file is required
usually by looking at the extension.
If it's not obvious from the filename what output format is
intended, an error will result.
<p>This parameter must only be given if
<code>omode</code>
has its default value of "<code>out</code>".
</p>
<p>[Default: <code>(auto)</code>]
</p>
</dd>
<dt><strong><code>omode = out|meta|stats|count|cgi|discard|topcat|samp|tosql|gui</code> <em>(<a href="http://andromeda.star.bris.ac.uk/starjavadocs/uk/ac/starlink/ttools/mode/ProcessingMode.html">ProcessingMode</a>)</em></strong></dt>
<dd>The mode in which the result table will be output.
The default mode is <code>out</code>, which means that
the result will be written as a new table to disk or elsewhere,
as determined by the <code>out</code> and <code>ofmt</code>
parameters.
However, there are other possibilities, which correspond
to uses to which a table can be put other than outputting it,
such as displaying metadata, calculating statistics,
or populating a table in an SQL database.
For some values of this parameter, additional parameters
(<code><mode-args></code>)
are required to determine the exact behaviour.
<p>Possible values are
<ul>
<li><code>out</code></li>
<li><code>meta</code></li>
<li><code>stats</code></li>
<li><code>count</code></li>
<li><code>cgi</code></li>
<li><code>discard</code></li>
<li><code>topcat</code></li>
<li><code>samp</code></li>
<li><code>tosql</code></li>
<li><code>gui</code></li>
</ul>
Use the <code>help=omode</code> flag
or see <a href="outModes.html">Section 6.4</a> for more information.
</p>
<p>[Default: <code>out</code>]
</p>
</dd>
<dt><strong><code>out = <out-table></code> <em>(<a href="http://andromeda.star.bris.ac.uk/starjavadocs/uk/ac/starlink/ttools/TableConsumer.html">TableConsumer</a>)</em></strong></dt>
<dd>The location of the output table. This is usually a filename
to write to.
If it is equal to the special value "-" (the default)
the output table will be written to standard output.
<p>This parameter must only be given if
<code>omode</code>
has its default value of "<code>out</code>".
</p>
<p>[Default: <code>-</code>]
</p>
</dd>
<dt><strong><code>start = <float-value></code> <em>(Double)</em></strong></dt>
<dd>Gives the starting value of the loop variable.
This will the the value in the first row of the table.
<p>[Default: <code>0.0</code>]
</p>
</dd>
<dt><strong><code>step = <float-value></code> <em>(Double)</em></strong></dt>
<dd>Amount by which the loop variable will be incremented
at each iteration, i.e. each table row.
<p>[Default: <code>1.0</code>]
</p>
</dd>
</dl>
</p>
<hr><a href="tloopExamples.html">Next</a> <a href="tloop.html">Previous</a> <a href="tloop.html">Up</a> <a href="index.html">Contents</a> <br> <b>Next: </b><a href="tloopExamples.html">Examples</a><br>
<b>Up: </b><a href="tloop.html">tloop: Generates a single-column table from a loop variable</a><br>
<b>Previous: </b><a href="tloop.html">tloop: Generates a single-column table from a loop variable</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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