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<h4><a name="layer-spectrogram">8.3.32 <code>spectrogram</code></a></h4>
<p>Plots spectrograms.
A spectrogram is a sequence of spectra plotted as vertical 1-d images, each one
plotted at a different horizontal coordinate.
</p>
<p>This specialised layer is only available for
<a href="plot2time.html"><code>time</code></a> plots.
</p>
<p>The way that data values are mapped
to colours is usually controlled by options
at the level of the plot itself,
rather than by per-layer configuration.
</p>
<p>
<strong>Usage Overview:</strong>
<pre>
layerN=spectrogram tN=<time-expr> spectrumN=<array-expr> twidthN=<num-expr>
inN=<table> ifmtN=<in-format> istreamN=true|false
icmdN=<cmds>
</pre>
</p>
<p>All the parameters listed here
affect only the relevant layer,
identified by the suffix
<code>N</code>.
</p>
<p>
<strong>Example:</strong>
</p>
<div align="center"><img src="plot2-layer-spectrogram.png" alt="" align="middle"></div>
<p><pre> stilts plot2time <strong>layer1=spectrogram</strong> <strong>in1=LRS_NPW_V010_20071101.cdf</strong> <strong>t1=epoch</strong> <strong>spectrum1=RX2</strong>
auxfunc=linear auxmap=plasma auxclip=0,1
xpix=600 ypix=300
tmin=2007-11-01T00 tmax=2007-11-01T12 ymax=500</pre></p>
<p>
<dl>
<dt><strong><code>icmdN = <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 layer N input table as specified by parameter <code>inN</code>.
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>ifmtN = <in-format></code> <em>(String)</em></strong></dt>
<dd>Specifies the format of the input table as specified by parameter <code>inN</code>.
The known formats are listed in <a href="inFormats.html">Section 5.2.1</a>.
This flag can be used if you know what format your
table is in.
If it has the special value
<code>(auto)</code> (the default),
then an attempt will be
made to detect the format of the table automatically.
This cannot always be done correctly however, in which case
the program will exit with an error explaining which
formats were attempted.
<p>[Default: <code>(auto)</code>]
</p>
</dd>
<dt><strong><code>inN = <table></code> <em>(<a href="http://www.starlink.ac.uk/stil/javadocs/uk/ac/starlink/table/StarTable.html">StarTable</a>)</em></strong></dt>
<dd>The location of the input table.
This may take one of the following forms:
<ul>
<li>A filename.</li>
<li>A URL.</li>
<li>The special value "<code>-</code>",
meaning standard input.
In this case the input format must be given explicitly
using the <code>ifmtN</code>
parameter.
Note that not all formats can be streamed in this way.
</li>
<li>A system command line with
either a "<code><</code>" character at the start,
or a "<code>|</code>" character at the end
("<code><syscmd</code>" or
"<code>syscmd|</code>").
This executes the given pipeline and reads from its
standard output.
This will probably only work on unix-like systems.
</li>
</ul>
In any case, compressed data in one of the supported compression
formats (gzip, Unix compress or bzip2) will be decompressed
transparently.
</dd>
<dt><strong><code>istreamN = true|false</code> <em>(Boolean)</em></strong></dt>
<dd>If set true, the input table
specified by the <code>inN</code> parameter
will be read as a stream.
It is necessary to give the
<code>ifmtN</code> parameter
in this case.
Depending on the required operations and processing mode,
this may cause the read to fail (sometimes it is necessary
to read the table more than once).
It is not normally necessary to set this flag;
in most cases the data will be streamed automatically
if that is the best thing to do.
However it can sometimes result in less resource usage when
processing large files in certain formats (such as VOTable).
<p>[Default: <code>false</code>]
</p>
</dd>
<dt><strong><code>spectrumN = <array-expr></code> <em>(String)</em></strong></dt>
<dd>Provides an array of spectral samples at each
data point.
The value must be a numeric array
(e.g. the value of an array-valued column).
<p>The value is a <code>Object</code> algebraic expression based on column names
as described in <a href="jel.html">Section 10</a>.
</p>
</dd>
<dt><strong><code>tN = <time-expr></code> <em>(String)</em></strong></dt>
<dd>Time coordinate.
<p>The value is a <code>Object</code> algebraic expression based on column names
as described in <a href="jel.html">Section 10</a>.
</p>
</dd>
<dt><strong><code>twidthN = <num-expr></code> <em>(String)</em></strong></dt>
<dd>Range on the Time axis
over which the spectrum is plotted.
If no value is supplied, an attempt will be made
to determine it automatically by looking at the
spacing of the Time coordinates
plotted in the spectrogram.
<p>The value is a numeric algebraic expression based on column names
as described in <a href="jel.html">Section 10</a>.
</p>
</dd>
</dl>
</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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