NAME

       gbfun - Apply functions to table of data

SYNOPSIS

       gbfun [options] <function definition> ...

DESCRIPTION

       Compute  arbitrary  colum-wise  functions on data read from standard input.  Variable 'xi'
       stands for the i-th column while 'x0' stands for the row number, e.g. a function  f(x1,x2)
       operates  on  the first and secod column.  With the option -t the function is computed, in
       turn, on every column. In this case f(x1,x2) stands for a function of  the  column  itself
       and  of  the  following  column  (the  index being a lead operator). In these cases 'x' is
       equivalent to 'x1'. With -r or -R the function is recursevely computed "columwise" on each
       row. In this case the variable 'x' identifies the result of the previous evaluation. A lag
       operator can be specified with the letter l, like in 'x1l2', which means the first  column
       two steps before.  More functions can be specified and will be considered in turn.

OPTIONS

       -t     compute on each column

       -r     set initial value and compute recursively

       -R     set initial value, compute recursively and print intermediary results

       -v     verbose mode

       -F     specify the input fields separators (default " \t")

       -o     set the output format (default '%12.6e')

       -s     set the output separation string (default ' ')

       -h     this help

EXAMPLES

       gbfun 'x0+log(x2)' file
              print  the  log of the second column of 'file' adding the progressive number of the
              row

       gbfun -r 0 'x+sqrt(x1)' file
              print the sum of the square root of the elements of the first column of 'file'

AUTHOR

       Written by Giulio Bottazzi

REPORTING BUGS

       Report bugs to <gbutils@googlegroups.com>

       Package home page <http://cafim.sssup.it/~giulio/software/gbutils/index.html>

COPYRIGHT

       Copyright © 2001-2015 Giulio Bottazzi This program is free software; you can  redistribute
       it  and/or  modify  it  under  the  terms of the GNU General Public License (version 2) as
       published by the Free Software Foundation;

       This program is distributed in the hope that it will be useful, but WITHOUT ANY  WARRANTY;
       without  even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
       See the GNU General Public License for more details.