Provided by: gbutils_5.7.1-1_amd64

**NAME**

gbfun - Apply functions to table of data

**SYNOPSIS**

gbfun[options]<functiondefinition>...

**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-tthe 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-ror-Rthe 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**

-Tcompute the function row-wise, on each column separately.-tcompute on each column-rset initial value and compute recursively-Rset initial value, compute recursively and print intermediary results-vverbose mode-Fspecify the input fields separators (default " \t")-oset the output format (default '%12.6e')-sset the output separation string (default ' ')-hthis 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.