minmax

       minmax - Find extreme values in data tables

SYNOPSIS

       minmax [ files] [ -C ] [ -D ] [ -H[nrec] ] [ -Idx[/dy] ] [
       -L ] [ -M[flag] ] [ -: ] [ -bi[s][n] ]

DESCRIPTION

       minmax 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, minmax 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
       -Rw/e/s/n which can be used directly in the  command  line
       for other programs, or simply in column form.

       xyzfile
              ASCII  [or  binary, see -b] file(s) holding a fixed
              number of data columns.

OPTIONS

       -C     Report the min/max values per  column  in  separate
              columns [Default uses <min/max> format]

       -D     Sets   longitude   discontinuity  to  the  Dateline
              (-180/+180)   [Default   is   Greenwich   (0-360)].
              Requires -L.

       -H     Input  file(s)  has  Header  record(s).  Number  of
              header records can be changed by editing your .gmt­
              defaults  file.  If  used,  GMT default is 1 header
              record.

       -I     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 -C is set).

       -L     Indicates that the x  column  contains  longitudes,
              which  may  be  periodic  in  360  degrees [Default
              assumes no periodicity].

       -M     Multiple segment file(s). Segments are separated by
              a  special record.  For ASCII files the first char­
              acter must be flag [Default is  '>'].   For  binary
              files all fields must be NaN.

       -:     Toggles  between  (longitude,latitude)  and  (lati­
              tude,longitude) input/output. [Default  is  (longi­
              tude,latitude)].  Applies to geographic coordinates
              only.  Only works when -I is selected.

       -bi    Selects binary input. Append s for single precision
              columns].

EXAMPLES

       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
       psxy, try

       psxy `minmax -I5 track.xy` track.xy -Jx1 -B5 -P > track.ps

       To find the min  and  max  values  for  each  column,  but
       rounded to integers, try

       minmax junkfile -C -I1

SEE ALSO

       gmt(l)