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<title>MINMAX</title>
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<h1 align="center">MINMAX</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="#ASCII FORMAT PRECISION">ASCII FORMAT PRECISION</a><br>
<a href="#EXAMPLES">EXAMPLES</a><br>
<a href="#BUGS">BUGS</a><br>
<a href="#SEE ALSO">SEE ALSO</a><br>
<hr>
<h2>NAME
<a name="NAME"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">minmax −
Find extreme values in data tables</p>
<h2>SYNOPSIS
<a name="SYNOPSIS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>minmax</b> [
<i>files</i>] [ <b>−C</b> ] [
<b>−EL</b>|<b>l</b>|<b>H</b>|<b>h</b><i>col</i> ] [
<b>−H</b>[<b>i</b>][<i>nrec</i>] ] [
<b>−I</b>[<b>p</b>]<i>dx</i>[/<i>dy</i>[/<i>dz</i>...]
] [ <b>−S</b>[<b>x</b>][<b>y</b>] ] [
<b>−T</b><i>dz</i>[/<i>col</i>] ] [
<b>−:</b>[<b>i</b>|<b>o</b>] ] [
<b>−bi</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>−f</b>[<b>i</b>|<b>o</b>]<i>colinfo</i> ] [
<b>−m</b>[<b>i</b>|<b>o</b>][<i>flag</i>] ]</p>
<h2>DESCRIPTION
<a name="DESCRIPTION"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>minmax</b>
reads its standard input [or from files] and finds the
extreme values in each of the columns. It recognizes NaNs
and will print warnings if the number of columns vary from
record to record. As an option, <b>minmax</b> will find the
extent of the first <i>n</i> columns rounded up and down to
the nearest multiple of the supplied increments. By default,
this output will be in the form
<b>−R</b><i>w/e/s/n</i> which can be used directly in
the command line for other programs (hence only <i>dx</i>
and <i>dy</i> are needed), or the output will be in column
form for as many columns as there are increments provided. A
similar option (<b>−T</b>) will provide a
<b>−T</b><i>zmin/zmax/dz</i> string for makecpt.
<i><br>
xyzfile</i></p>
<p style="margin-left:22%;">ASCII [or binary, see
<b>−b</b>] file(s) holding a fixed number of data
columns.</p>
<h2>OPTIONS
<a name="OPTIONS"></a>
</h2>
<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"><b>−C</b></p></td>
<td width="7%"></td>
<td width="78%">
<p style="margin-top: 1em">Report the min/max values per
column in separate columns [Default uses <min/max>
format].</p> </td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="4%">
<p><b>−E</b></p></td>
<td width="7%"></td>
<td width="78%">
<p>Returns the record whose column <i>col</i> contains the
minimum (<b>l</b>) or maximum (<b>h</b>) value. Upper case
(<b>L|H</b>) works on absolute value of the data. In case of
multiple matches, only the first record is returned.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="4%">
<p><b>−H</b></p></td>
<td width="7%"></td>
<td width="78%">
<p>Input file(s) has header record(s). If used, the default
number of header records is <b><A HREF="gmtdefaults.html#N_HEADER_RECS">N_HEADER_RECS</A></b>. Use
<b>−Hi</b> if only input data should have header
records [Default will write out header records if the input
data have them]. Blank lines and lines starting with # are
always skipped.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="4%">
<p><b>−I</b></p></td>
<td width="7%"></td>
<td width="78%">
<p>Report the min/max of the first <i>n</i> columns to the
nearest multiple of the provided increments (separate the
<i>n</i> increments by slashes), and output results in the
form <b>−R</b><i>w/e/s/n</i> (unless <b>−C</b>
is set). If only one increment is given we also use it for
the second column (for backwards compatibility). To override
this behaviour, use <b>−Ip</b><i>dx</i>.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="4%">
<p><b>−S</b></p></td>
<td width="7%"></td>
<td width="78%">
<p>Add extra space for error bars. Useful together with
<b>−I</b> option and when later plotting with <b>psxy
−E</b>. <b>−Sx</b> leaves space for horizontal
error bars using the values in third (2) column.
<b>−Sy</b> leaves space for vertical error bars using
the values in third (2) column. <b>−S</b> or
<b>−Sxy</b> leaves space for both error bars using the
values in third and fourth (2 and 3) columns.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="4%">
<p><b>−T</b></p></td>
<td width="7%"></td>
<td width="78%">
<p>Report the min/max of the first (0’th) column to
the nearest multiple of <i>dz</i> and output this in the
form <b>−T</b><i>zmin/zmax/dz</i>. To use another
column, append /<i>col</i>.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="4%">
<p><b>−:</b></p></td>
<td width="7%"></td>
<td width="78%">
<p>Toggles between (longitude,latitude) and
(latitude,longitude) input and/or output. [Default is
(longitude,latitude)]. Append <b>i</b> to select input only
or <b>o</b> to select output only. [Default affects both].
Only works when <b>−I</b> is selected.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="4%">
<p><b>−bi</b></p></td>
<td width="7%"></td>
<td width="78%">
<p>Selects binary input. 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 columns in your binary input file
if it exceeds the columns needed by the program. Or append
<b>c</b> if the input file is netCDF. Optionally, append
<i>var1</i><b>/</b><i>var2</i><b>/</b><i>...</i> to specify
the variables to be read. [Default is 2 input columns].</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="4%">
<p><b>−f</b></p></td>
<td width="7%"></td>
<td width="78%">
<p>Special formatting of input and/or output columns (time
or geographical data). Specify <b>i</b> or <b>o</b> to make
this apply only to input or output [Default applies to
both]. Give one or more columns (or column ranges) separated
by commas. Append <b>T</b> (absolute calendar time),
<b>t</b> (relative time in chosen <b><A HREF="gmtdefaults.html#TIME_UNIT">TIME_UNIT</A></b> since
<b><A HREF="gmtdefaults.html#TIME_EPOCH">TIME_EPOCH</A></b>), <b>x</b> (longitude), <b>y</b>
(latitude), or <b>f</b> (floating point) to each column or
column range item. Shorthand
<b>−f</b>[<b>i</b>|<b>o</b>]<b>g</b> means
<b>−f</b>[<b>i</b>|<b>o</b>]0<b>x</b>,1<b>y</b>
(geographic coordinates).</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="4%">
<p><b>−m</b></p></td>
<td width="7%"></td>
<td width="78%">
<p>Multiple segment file(s). Segments are separated by a
special record. For ASCII files the first character must be
<i>flag</i> [Default is ’>’]. For binary
files all fields must be NaN and <b>−b</b> must set
the number of output columns explicitly. By default the
<b>−m</b> setting applies to both input and output.
Use <b>−mi</b> and <b>−mo</b> to give separate
settings to input and output.</p></td></tr>
</table>
<h2>ASCII FORMAT PRECISION
<a name="ASCII FORMAT PRECISION"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">The ASCII
output formats of numerical data are controlled by
parameters in your .gmtdefaults4 file. Longitude and
latitude are formatted according to
<b><A HREF="gmtdefaults.html#OUTPUT_DEGREE_FORMAT">OUTPUT_DEGREE_FORMAT</A></b>, whereas other values are
formatted according to <b><A HREF="gmtdefaults.html#D_FORMAT">D_FORMAT</A></b>. Be aware that the
format in effect can lead to loss of precision in the
output, which can lead to various problems downstream. If
you find the output is not written with enough precision,
consider switching to binary output (<b>−bo</b> if
available) or specify more decimals using the
<b><A HREF="gmtdefaults.html#D_FORMAT">D_FORMAT</A></b> setting.</p>
<h2>EXAMPLES
<a name="EXAMPLES"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">To find the
extreme values in the file ship_gravity.xygd:</p>
<p style="margin-left:11%; margin-top: 1em"><b>minmax</b>
ship_gravity.xygd</p>
<p style="margin-left:11%; margin-top: 1em">Output should
look like</p>
<p style="margin-left:11%; margin-top: 1em">ship_gravity.xygd:
N = 6992 <326.125/334.684> <-28.0711/-8.6837>
<-47.7/177.6> <0.6/3544.9></p>
<p style="margin-left:11%; margin-top: 1em">To find the
extreme values in the file track.xy to the nearest 5 units
and use this region to draw a line using psxy, run</p>
<p style="margin-left:11%; margin-top: 1em"><b><A HREF="psxy.html">psxy</A></b>
‘<b>minmax −I</b> 5 track.xy‘ track.xy
<b>−Jx</b> 1 <b>−B</b> 5 <b>−P</b> >
track.ps</p>
<p style="margin-left:11%; margin-top: 1em">To find the min
and max values for each of the first 4 columns, but rounded
to integers, use</p>
<p style="margin-left:11%; margin-top: 1em"><b>minmax</b>
junkfile <b>−C −I</b> 1/1/1/1</p>
<h2>BUGS
<a name="BUGS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">The
<b>−I</b> option does not yet work properly with time
series data (e.g., <b>−f</b> 0T). Thus, such variable
intervals as months and years are not calculated. Instead,
specify your interval in the same units as the current
setting of <b><A HREF="gmtdefaults.html#TIME_UNIT">TIME_UNIT</A></b>.</p>
<h2>SEE ALSO
<a name="SEE ALSO"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><i><A HREF="GMT.html">GMT</A></i>(1)</p>
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