Provided by: gmt_4.5.11-1build1_amd64 bug

NAME

       minmax - Find extreme values in data tables

SYNOPSIS

       minmax [ files] [ -C ] [ -EL|l|H|hcol ] [ -H[i][nrec] ] [ -I[p]dx[/dy[/dz...] ] [ -S[x][y]
       ] [ -Tdz[/col] ] [ -:[i|o] ] [  -bi[s|S|d|D[ncol]|c[var1/...]]  ]  [  -f[i|o]colinfo  ]  [
       -m[i|o][flag] ]

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 n columns
       rounded up and down to the nearest multiple of the supplied increments.  By default,  this
       output  will  be  in the form -Rw/e/s/n which can be used directly in the command line for
       other programs (hence only dx and dy are needed), or the output will be in column form for
       as  many  columns  as there are increments provided.  A similar option (-T) will provide a
       -Tzmin/zmax/dz string for makecpt.

       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].

       -E     Returns  the record whose column col contains the minimum (l) or maximum (h) value.
              Upper case (L|H) works on absolute value of the data.  In case of multiple matches,
              only the first record is returned.

       -H     Input  file(s) has header record(s).  If used, the default number of header records
              is N_HEADER_RECS.  Use -Hi if only input data should have header  records  [Default
              will  write  out header records if the input data have them]. Blank lines and lines
              starting with # are always skipped.

       -I     Report the min/max of the first n columns to the nearest multiple of  the  provided
              increments  (separate  the n increments by slashes), and output results in the form
              -Rw/e/s/n (unless -C is set).  If only one increment is given we also  use  it  for
              the  second  column (for backwards compatibility).  To override this behaviour, use
              -Ipdx.

       -S     Add extra space for error bars. Useful together  with  -I  option  and  when  later
              plotting with psxy -E.  -Sx leaves space for horizontal error bars using the values
              in third (2) column.  -Sy leaves space for vertical error bars using the values  in
              third  (2) column.  -S or -Sxy leaves space for both error bars using the values in
              third and fourth (2 and 3) columns.

       -T     Report the min/max of the first (0'th) column to the nearest  multiple  of  dz  and
              output this in the form -Tzmin/zmax/dz.  To use another column, append /col.

       -:     Toggles  between (longitude,latitude) and (latitude,longitude) input and/or output.
              [Default is (longitude,latitude)].  Append i to select input only or  o  to  select
              output only.  [Default affects both].  Only works when -I is selected.

       -bi    Selects  binary  input.   Append  s  for  single precision [Default is d (double)].
              Uppercase S or D will force byte-swapping.  Optionally, append ncol, the number  of
              columns  in your binary input file if it exceeds the columns needed by the program.
              Or append c if the input  file  is  netCDF.  Optionally,  append  var1/var2/...  to
              specify the variables to be read.  [Default is 2 input columns].

       -f     Special  formatting  of  input  and/or  output columns (time or geographical data).
              Specify i or o to make this apply only to  input  or  output  [Default  applies  to
              both].   Give one or more columns (or column ranges) separated by commas.  Append T
              (absolute calendar time), t (relative time in chosen TIME_UNIT since TIME_EPOCH), x
              (longitude),  y  (latitude),  or  f (floating point) to each column or column range
              item.  Shorthand -f[i|o]g means -f[i|o]0x,1y (geographic coordinates).

       -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 and -b must set the number of  output  columns  explicitly.   By
              default  the  -m setting applies to both input and output.  Use -mi and -mo to give
              separate settings to input and output.

ASCII FORMAT PRECISION

       The ASCII  output  formats  of  numerical  data  are  controlled  by  parameters  in  your
       .gmtdefaults4    file.     Longitude    and    latitude   are   formatted   according   to
       OUTPUT_DEGREE_FORMAT, whereas other values are formatted according to D_FORMAT.  Be  aware
       that  the  format in effect can lead to loss of precision in the output, which can lead to
       various problems downstream.  If you find the output is not written with enough precision,
       consider  switching to binary output (-bo if available) or specify more decimals using the
       D_FORMAT setting.

EXAMPLES

       To find the extreme values in the file ship_gravity.xygd:

       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, run

       psxy `minmax -I 5 track.xy` track.xy -Jx 1 -B 5 -P > track.ps

       To find the min and max values for each of the first 4 columns, but rounded  to  integers,
       use

       minmax junkfile -C -I 1/1/1/1

BUGS

       The  -I option does not yet work properly with time series data (e.g., -f 0T).  Thus, such
       variable intervals as months and years are not calculated.  Instead, specify your interval
       in the same units as the current setting of TIME_UNIT.

SEE ALSO

       GMT(1)