NAME

     minmax - Find extreme values in ASCII tables

SYNOPSIS

     minmax [ asciifiles] [ -C ] [ -H ] [ -Idx[/dy] ] [ -: ]

DESCRIPTION

     minmax reads its standard input  [or  from  asciifiles]  and
     finds  the extreme values in each of the columns.  It recog-
     nizes 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.

     xyzfile
          ASCII file holding a fixed number of data columns.

OPTIONS

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

     -H    Input file(s) has Header record(s).  Number of  header
          records  can  be  changed  by editing your .gmtdefaults
          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.

       -   :    Toggles    between    (longitude,latitude)    and
          (latitude,longitude)    input/output.     [Default   is
          (longitude,latitude)] Only works when -I is selected.

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

SEE ALSO

     gmt

REFERENCES

     Wessel, P., and W. H. F. Smith, 1995,  The  Generic  Mapping
     Tools  (GMT)  version  3.0  Technical  Reference & Cookbook,
     SOEST/NOAA.
     Wessel, P., and W. H. F. Smith, 1995,  New  Version  of  the
     Generic Mapping Tools Released, EOS Trans. AGU, 76, p. 329.
     Wessel, P., and W. H. F. Smith, 1995,  New  Version  of  the
     Generic           Mapping           Tools          Released,
     http://www.agu.org/eos_elec/95154e.html, Copyright  1995  by
     the American Geophysical Union.
     Wessel, P., and W. H. F. Smith, 1991,  Free  Software  Helps
     Map and Display Data, EOS Trans. AGU, 72, p. 441.