## 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