NAME

       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 .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).

       -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  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)].  Applies to geographic coordinates only.  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(1gmt)

                                            1 Jan 2004                                  MINMAX(l)