NAME

      minmax - Find extreme values in data tables

SYNOPSIS

      minmax [ files] [ -C ] [ -H[nrec] ] [ -Idx[/dy] ] [ -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]

      -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
           (unless -C is set).

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

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

      -bi  Selects binary input.  Append s for single precision [Default is
           double].  Append n for the number of columns in the binary
           file(s).  [Default is 2 input 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