NAME

       gbfun - Apply functions to table of data

SYNOPSIS

       gbfun [options] <function definition> ...

DESCRIPTION

       Compute  specified  functions  on data read from standard input. The default is to perform
       the computation column-wise, on each row of data separately.  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 the function row-wise, on each column separately.

       -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 -T 'x0+log(x2)' < file
              print  the  log  of  the  second row of 'file' adding the progressive number of the
              column

       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 © 2001-2018 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.