Provided by: gbutils_5.6.8-1build1_amd64 
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.