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 warn-
       ings 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 mul-
              tiple 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  inte-
       gers, try

       minmax junkfile -C -I1


SEE ALSO

       gmt(l)



GMT3.4.6                          1 Jan 2005                         MINMAX(l)

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