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<HTML>
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<TITLE>minmax</TITLE>
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<H1>minmax</H1>
<HR>
<PRE>
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minmax - Find extreme values in data tables
</PRE>
<H2>SYNOPSIS</H2><PRE>
<B>minmax</B> [ <I>files</I>] [ <B>-C</B> ] [ <B>-D</B> ] [ <B>-H</B>[<I>nrec</I>] ] [ <B>-I</B><I>dx</I>[/<I>dy</I>] ] [
<B>-L</B> ] [ <B>-M</B>[<I>flag</I>] ] [ <B>-:</B> ] [ <B>-bi</B>[<B>s</B>][<I>n</I>] ]
</PRE>
<H2>DESCRIPTION</H2><PRE>
<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 two columns rounded up and down to the
nearest multiple of dx/dy. 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, or simply in column form.
<I>xyzfile</I>
ASCII [or binary, see <B>-b</B>] file(s) holding a fixed
number of data columns.
</PRE>
<H2>OPTIONS</H2><PRE>
<B>-C</B> Report the min/max values per column in separate
columns [Default uses <min/max> format]
<B>-D</B> Sets longitude discontinuity to the Dateline
(-180/+180) [Default is Greenwich (0-360)].
Requires <B>-L</B>.
<B>-H</B> Input file(s) has Header record(s). Number of
header records can be changed by editing your .gmt
defaults file. If used, <B><A HREF="GMT.html">GMT</A></B> default is 1 header
record.
<B>-I</B> Report the min/max of the first two columns to the
nearest multiple of dx and dy, and output this in
the form -Rw/e/s/n (unless <B>-C</B> is set).
<B>-L</B> Indicates that the x column contains longitudes,
which may be periodic in 360 degrees [Default
assumes no periodicity].
<B>-M</B> Multiple segment file(s). Segments are separated by
a special record. For ASCII files the first char
acter must be <I>flag</I> [Default is '>']. For binary
files all fields must be NaN.
<B>-:</B> Toggles between (longitude,latitude) and (lati
tude,longitude) input/output. [Default is (longi
tude,latitude)]. Applies to geographic coordinates
only. Only works when <B>-I</B> is selected.
<B>-bi</B> Selects binary input. Append <B>s</B> for single precision
columns].
</PRE>
<H2>EXAMPLES</H2><PRE>
To find the extreme values in the file ship_gravity.xygd,
try
minmax ship_gravity.xygd
Output should look like
ship_gravity.xygd: N = 6992 <326.125/334.684>
<-28.0711/-8.6837> <-47.7/177.6> <0.6/3544.9>
To find the extreme values in the file track.xy to the
nearest 5 units and use this region to draw a line using
<A HREF="psxy.html">psxy</A>, try
psxy `minmax <B>-I</B>5 track.xy` track.xy <B>-Jx</B>1 <B>-B</B>5 <B>-P</B> > track.ps
To find the min and max values for each column, but
rounded to integers, try
minmax junkfile <B>-C</B> <B>-I</B>1
</PRE>
<H2>SEE ALSO</H2><PRE>
<I>gmt</I>(l)
</PRE>
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