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<hr>
<h3><a name="tmatchn-usage">B.32.1 Usage</a></h3>
<p>The usage of <code>tmatchn</code> is
<pre>
stilts <stilts-flags> tmatchn nin=<count> ifmtN=<in-format> inN=<tableN>
icmdN=<cmds> ocmd=<cmds>
omode=out|meta|stats|count|cgi|discard|topcat|samp|tosql|gui
out=<out-table> ofmt=<out-format>
multimode=pairs|group iref=<table-index>
matcher=<matcher-name> params=<match-params>
tuning=<tuning-params> valuesN=<expr-list>
joinN=default|match|nomatch|always
fixcols=none|dups|all suffixN=<label>
progress=none|log|profile
</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.TableMatchN</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>fixcols = none|dups|all</code> <em>(<a href="http://andromeda.star.bris.ac.uk/starjavadocs/uk/ac/starlink/ttools/task/JoinFixActionParameter.Fixer.html">Fixer</a>)</em></strong></dt>
<dd>Determines how input columns are renamed before
use in the output table. The choices are:
<ul>
<li><code>none</code>: columns are not renamed
</li>
<li><code>dups</code>: columns which would otherwise have duplicate names in the output will be renamed
to indicate which table they came from
</li>
<li><code>all</code>: all columns will be renamed to indicate which table they came from
</li>
</ul>
If columns are renamed, the new ones are determined
by <code>suffix*</code> parameters.
<p>[Default: <code>dups</code>]
</p>
</dd>
<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
input table #N as specified by parameter <code>inN</code>,
before any 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>ifmtN = <in-format></code> <em>(String)</em></strong></dt>
<dd>Specifies the format of input table #N 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 = <tableN></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 input table #N.
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>iref = <table-index></code> <em>(Integer)</em></strong></dt>
<dd>If <code>multimode</code>=<code>pairs</code>
this parameter gives the index of the table in the input table
list which is to serve as the reference table
(the one which must be matched by other tables).
Ignored in other modes.
<p>Row ordering in the output table is usually tidiest
if the default setting of 1 is used
(i.e. if the first input table is used as the reference table).
</p>
<p>[Default: <code>1</code>]
</p>
</dd>
<dt><strong><code>joinN = default|match|nomatch|always</code> <em>(<a href="http://www.starlink.ac.uk/stil/javadocs/uk/ac/starlink/table/join/MultiJoinType.html">MultiJoinType</a>)</em></strong></dt>
<dd>Determines which rows
from input table N
are included in the output table.
The matching algorithm determines which of the rows in
each of the input tables correspond to which rows in
the other input tables, and this parameter determines
what to do with that information.
<p>The default behaviour is that a row will appear in the
output table if it represents a match of rows from two or
more of the input tables.
This can be altered on a per-input-table basis however
by choosing one of the non-default options below:
<ul>
<li><code>match</code>:
Rows are included only if they contain an entry from
input table N.
</li>
<li><code>nomatch</code>:
Rows are included only if they do not contain an entry from
input table N.
</li>
<li><code>always</code>:
Rows are included if they contain an entry from
input table N
(overrides any match and nomatch
settings of other tables).
</li>
<li><code>default</code>:
Input table N has no special effect on
whether rows are included.
</li>
</ul>
</p>
<p>[Default: <code>default</code>]
</p>
</dd>
<dt><strong><code>matcher = <matcher-name></code> <em>(<a href="http://www.starlink.ac.uk/stil/javadocs/uk/ac/starlink/table/join/MatchEngine.html">MatchEngine</a>)</em></strong></dt>
<dd>Defines the nature of the matching that will be performed.
Depending on the name supplied, this may be positional
matching using celestial or Cartesian coordinates,
exact matching on the value of a string column,
or other things.
A list and explanation of the available matching algorithms
is given in <a href="MatchEngine.html">Section 7.1</a>.
The value supplied for this parameter determines the meanings
of the values required by the
<code>params</code>,
<code>values*</code> and
<code>tuning</code>
parameter(s).
<p>[Default: <code>sky</code>]
</p>
</dd>
<dt><strong><code>multimode = pairs|group</code> <em>(String)</em></strong></dt>
<dd>Defines what is meant by a multi-table match.
There are two possibilities:
<ul>
<li><code>pairs</code>:
Each output row corresponds to a single row of the
<em>reference table</em>
(see parameter <code>iref</code>)
and contains entries from other tables which are pair matches
to that.
If a reference table row matches multiple rows from one of
the other tables, only the best one is included.
</li>
<li><code>group</code>:
Each output row corresponds to a group of entries from the
input tables which are
mutually linked by pair matches between them.
This means that although you can get from any entry to any
other entry via one or more pair matches,
there is no guarantee that any entry
is a pair match with any other entry.
No table has privileged status in this case.
If there are multiple entries from a given table in the
match group, an arbitrary one is chosen for inclusion
(there is no unique way to select the best).
See <a href="matchGroup.html">Section 7.2</a> for more discussion.
</li>
</ul>
In the case of well-separated objects these modes will give
the same results. For crowded fields however it will make
a difference which is chosen.
<p>Note that which rows actually appear in the output
is also influenced by the
<code>joinN</code>
parameter.
</p>
<p>[Default: <code>pairs</code>]
</p>
</dd>
<dt><strong><code>nin = <count></code> <em>(Integer)</em></strong></dt>
<dd>The number of input tables for this task.
For each of the input tables N
there will be associated parameters
<code>ifmtN</code>, <code>inN</code> and <code>icmdN</code>.
</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>params = <match-params></code> <em>(String[])</em></strong></dt>
<dd>Determines the parameters of this match.
This is typically one or more tolerances such as error radii.
It may contain zero or more values; the values that are
required depend on the match type selected by the
<code>matcher</code> parameter.
If it contains multiple values, they must be separated by spaces;
values which contain a space can be 'quoted' or "quoted".
</dd>
<dt><strong><code>progress = none|log|profile</code> <em>(String)</em></strong></dt>
<dd>Determines whether information on progress of the match
should be output to the standard error stream as it progresses.
For lengthy matches this is a useful reassurance and can give
guidance about how much longer it will take.
It can also be useful as a performance diagnostic.
<p>The options are:
<ul>
<li><code>none</code>:
no progress is shown
</li>
<li><code>log</code>:
progress information is shown
</li>
<li><code>profile</code>:
progress information and limited time/memory profiling
information are shown
</li>
</ul>
</p>
<p>[Default: <code>log</code>]
</p>
</dd>
<dt><strong><code>suffixN = <label></code> <em>(String)</em></strong></dt>
<dd>If the <code>fixcols</code> parameter
is set so that input columns are renamed for insertion into
the output table, this parameter determines how the
renaming is done.
It gives a suffix which is appended to all renamed columns
from table N.
<p>[Default: <code>_N</code>]
</p>
</dd>
<dt><strong><code>tuning = <tuning-params></code> <em>(String[])</em></strong></dt>
<dd>Tuning values for the matching process, if appropriate.
It may contain zero or more values; the values that are
permitted depend on the match type selected by the
<code>matcher</code> parameter.
If it contains multiple values, they must be separated by spaces;
values which contain a space can be 'quoted' or "quoted".
If this optional parameter is not supplied, sensible defaults
will be chosen.
</dd>
<dt><strong><code>valuesN = <expr-list></code> <em>(String[])</em></strong></dt>
<dd>Defines the values from
table N
which are used to determine whether a match has occurred.
These will typically be coordinate values such as RA and Dec
and perhaps some per-row error values as well, though exactly
what values are required is determined by the kind of match
as determined by <code>matcher</code>.
Depending on the kind of match, the number and type of
the values required will be different.
Multiple values should be separated by whitespace;
if whitespace occurs within a single value it must be
'quoted' or "quoted".
Elements of the expression list are commonly just column
names, but may be algebraic expressions calculated from
zero or more columns as explained in <a href="jel.html">Section 10</a>.
</dd>
</dl>
</p>
<hr><a href="secB.32.2.html">Next</a> <a href="tmatchn.html">Previous</a> <a href="tmatchn.html">Up</a> <a href="index.html">Contents</a> <br> <b>Next: </b><a href="secB.32.2.html">Examples</a><br>
<b>Up: </b><a href="tmatchn.html">tmatchn: Crossmatches multiple tables using flexible criteria</a><br>
<b>Previous: </b><a href="tmatchn.html">tmatchn: Crossmatches multiple tables using flexible criteria</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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