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<title>X2SYS_LIST</title>
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<h1 align=center>X2SYS_LIST</h1>
<a href="#NAME">NAME</a><br>
<a href="#SYNOPSIS">SYNOPSIS</a><br>
<a href="#DESCRIPTION">DESCRIPTION</a><br>
<a href="#OPTIONS">OPTIONS</a><br>
<a href="#EXAMPLES">EXAMPLES</a><br>
<a href="#SEE ALSO">SEE ALSO</a><br>
<hr>
<a name="NAME"></a>
<h2>NAME</h2>
<p style="margin-left:11%; margin-top: 1em">x2sys_list
− Output a subset of crossovers from data base</p>
<a name="SYNOPSIS"></a>
<h2>SYNOPSIS</h2>
<p style="margin-left:11%; margin-top: 1em"><b>x2sys_list
−C</b><i>column</i> <b>−T</b><i>TAG</i> [
<i>coedbase.txt</i> ] [ <b>−A</b><i>asymm_max</i> ] [
<b>−F</b><i>acdhiInNtTvxyz</i> ] [
<b>−I</b>[<i>list</i>] [
<b>−L</b>[<i>corrtable</i>] ] [
<b>−N</b><i>nx_min</i> ] [ <b>−Qe</b>|<b>i</b> ]
[
<b>−R</b><i>west</i>/<i>east</i>/<i>south</i>/<i>north</i>[<b>r</b>]
] [ <b>−S</b><i>track</i> ] [ <b>−V</b> ] [
<b>−W</b>[<i>list</i>] [
<b>−bo</b>[<b>s</b>|<b>S</b>|<b>d</b>|<b>D</b>[<i>ncol</i>]|<b>c</b>[<i>var1</i><b>/</b><i>...</i>]]
] [ <b>−m</b>[<i>flag</i>] ]</p>
<a name="DESCRIPTION"></a>
<h2>DESCRIPTION</h2>
<p style="margin-left:11%; margin-top: 1em"><b>x2sys_list</b>
will read the crossover ASCII data base <i>coedbase.txt</i>
(or <i>stdin</i>) and extract a subset of the crossovers
based on the other arguments. The output may be ASCII or
binary.</p>
<table width="100%" border=0 rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p style="margin-top: 1em" valign="top"><b>−C</b></p> </td>
<td width="8%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Specify which data
column you want to process. Crossovers related to this
column name must be present in the crossover data base.</p></td>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p style="margin-top: 1em" valign="top"><b>−T</b></p> </td>
<td width="8%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Specify the x2sys
<i>TAG</i> which tracks the attributes of this data
type.</p> </td>
</table>
<a name="OPTIONS"></a>
<h2>OPTIONS</h2>
<p style="margin-left:11%; margin-top: 1em">No space
between the option flag and the associated arguments.
<i><br>
coedbase.txt</i></p>
<p style="margin-left:22%;">The name of the input ASCII
crossover error data base as produced by <b><A HREF="x2sys_cross.html">x2sys_cross</A></b>.
If not given we read standard input instead.</p>
<table width="100%" border=0 rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="4%">
<p style="margin-top: 1em" valign="top"><b>−A</b></p> </td>
<td width="7%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Specifies maximum
asymmetry in the distribution of crossovers relative to the
mid point in time (or distance, if not time is available).
Asymmetry is computed as (n_right - n_left)/(n_right +
n_left), referring the the number of crossovers that falls
in the left or right half of the range. Symmetric
distributions will have values close to zero. If specified,
we exclude tracks whose asymmetry exceeds the specify cutoff
in absolute value [1, i.e., include all].</p></td>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="4%">
<p style="margin-top: 1em" valign="top"><b>−F</b></p> </td>
<td width="7%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Specify your
desired output using any combination of
<i>acdhiInNtTvwxyz</i>, in any order. Do not use space
between the letters, and note your selection is
case-sensitive. The output will be ASCII (or binary, see
<b>−bo</b>) columns of values. Description of codes:
<b>a</b> is the angle (< 90) defined by the crossing
tracks, <b>c</b> is crossover value of chosen observation
(see <b>−C</b>), <b>d</b> is distance along track,
<b>h</b> is heading along track, <b>i</b> is the signed time
interval between the visit at the crossover of the two
tracks involved, <b>I</b> is same as <b>i</b> but is
unsigned, <b>n</b> is the names of the two tracks, <b>N</b>
is the id numbers of the two tracks, <b>t</b> is time along
track in <i>date</i><b>T</b><i>clock</i> format (NaN if not
available), <b>T</b> is elapsed time since start of track
along track (NaN if not available), <b>v</b> is speed along
track, <b>w</b> is the composite weight, <b>x</b> is
<i>x</i>-coordinate (or longitude), <b>y</b> is
<i>y</i>-coordinate (or latitude), and <b>z</b> is observed
value (see <b>−C</b>) along track. If <b>−S</b>
is not specified then <b>d,h,n,N,t,T,v</b> results in two
output columns each: first for track one and next for track
two (in lexical order of track names); otherwise, they refer
to the specified track only (except for <b>n,N</b> which
then refers to the other track). The sign convention for
<b>c,i</b> is track one minus track two (lexically sorted).
Time intervals will be returned according to the
<b><A HREF="gmtdefaults.html#TIME_UNIT">TIME_UNIT</A></b> GMT defaults setting.</p></td>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="4%">
<p style="margin-top: 1em" valign="top"><b>−I</b></p> </td>
<td width="7%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Name of ASCII file
with a list of track names (one per record) that should be
excluded from consideration [Default includes all
tracks].</p> </td>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="4%">
<p style="margin-top: 1em" valign="top"><b>−L</b></p> </td>
<td width="7%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Apply optimal
corrections to the chosen observable. Append the correction
table to use [Default uses the correction table
<i>TAG</i>_corrections.txt which is expected to reside in
the <b>$X2SYS_HOME</b>/<i>TAG</i> directory]. For the format
of this file, see <b><A HREF="x2sys_solve.html">x2sys_solve</A></b>.</p></td>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="4%">
<p style="margin-top: 1em" valign="top"><b>−N</b></p> </td>
<td width="7%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Only report data
from pairs that generated at least <i>nx_min</i> crossovers
between them [use all pairs].</p></td>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="4%">
<p style="margin-top: 1em" valign="top"><b>−Q</b></p> </td>
<td width="7%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Append <b>e</b> for
external crossovers or <b>i</b> for internal crossovers only
[Default is all crossovers].</p></td>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="4%">
<p style="margin-top: 1em" valign="top"><b>−R</b></p> </td>
<td width="7%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top"><i>west, east,
south,</i> and <i>north</i> specify the Region of interest,
and you may specify them in decimal degrees or in
[+-]dd:mm[:ss.xxx][W|E|S|N] format. Append <b>r</b> if lower
left and upper right map coordinates are given instead of
w/e/s/n. The two shorthands <b>−Rg</b> and
<b>−Rd</b> stand for global domain (0/360 and
-180/+180 in longitude respectively, with -90/+90 in
latitude). Alternatively, specify the name of an existing
grid file and the <b>−R</b> settings (and grid
spacing, if applicable) are copied from the grid. For
Cartesian data just give <i>xmin/xmax/ymin/ymax</i>. This
option limits the COEs to those that fall inside the
specified domain.</p></td>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="4%">
<p style="margin-top: 1em" valign="top"><b>−S</b></p> </td>
<td width="7%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Name of a single
track. If given we restrict output to those crossovers
involving this track [Default output is crossovers involving
any track pair].</p></td>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="4%">
<p style="margin-top: 1em" valign="top"><b>−V</b></p> </td>
<td width="7%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Selects verbose
mode, which will send progress reports to stderr [Default
runs "silently"].</p></td>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="4%">
<p style="margin-top: 1em" valign="top"><b>−W</b></p> </td>
<td width="7%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Name of ASCII file
with a list of track names and their relative weights (one
track per record) that should be used to calculate the
composite crossover weight (output code <b>w</b> above).
[Default sets weights to 1].</p></td>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="4%">
<p style="margin-top: 1em" valign="top"><b>−bo</b></p> </td>
<td width="7%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Selects binary
output. Append <b>s</b> for single precision [Default is
<b>d</b> (double)]. Uppercase <b>S</b> or <b>D</b> will
force byte-swapping. Optionally, append <i>ncol</i>, the
number of desired columns in your binary output file.</p></td>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="4%">
<p style="margin-top: 1em" valign="top"><b>−m</b></p> </td>
<td width="7%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Multiple segment
output format. Segments with crossovers for a single track
pair are separated by a record whose first character is
<i>flag</i> and contains the two track names. [Default is
’>’].</p> </td>
</table>
<a name="EXAMPLES"></a>
<h2>EXAMPLES</h2>
<p style="margin-left:11%; margin-top: 1em">To find all the
magnetic crossovers associated with the tag MGD77 from the
file COE_data.txt, restricted to occupy a certain region in
the south Pacific, and return location, time, and crossover
value, try</p>
<p style="margin-left:11%; margin-top: 1em"><b>x2sys_list</b>
COE_data.txt <b>−V −T</b>MGD77
<b>−R</b>180/240/-60/-30 <b>−C</b>mag
<b>−F</b>xytz > mag_coe.txt</p>
<p style="margin-left:11%; margin-top: 1em">To find all the
faa crossovers globally that involves track 12345678 and
output time since start of the year, using a binary double
precision format, try</p>
<p style="margin-left:11%; margin-top: 1em"><b>x2sys_list</b>
COE_data.txt <b>−V −T</b>MGD77
<b>−C</b>faa <b>−S</b>12345678 <b>−F</b>Tz
<b>−bod</b> > faa_coe.b</p>
<a name="SEE ALSO"></a>
<h2>SEE ALSO</h2>
<p style="margin-left:11%; margin-top: 1em"><i><A HREF="x2sys_binlist.html">x2sys_binlist</A></i>(1),
<i><A HREF="x2sys_cross.html">x2sys_cross</A></i>(1), <i><A HREF="x2sys_datalist.html">x2sys_datalist</A></i>(1),
<i><A HREF="x2sys_get.html">x2sys_get</A></i>(1), <i><A HREF="x2sys_init.html">x2sys_init</A></i>(1),
<i><A HREF="x2sys_put.html">x2sys_put</A></i>(1), <i><A HREF="x2sys_report.html">x2sys_report</A></i>(1),
<i><A HREF="x2sys_solve.html">x2sys_solve</A></i>(1)</p>
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