NAME

       gbdummyfy - Produce dummies from labels

SYNOPSIS

       gbdummyfy [options]

DESCRIPTION

       This command reads from standard input a text file with space separated columns. The entry
       in one column (the first by default) are considered labels and expanded into a  matrix  of
       dummies  ,  i.e.  of  0  and 1 values. The number of columns of the matrix is equal to the
       number of different labels. Each row contains '1' in the place of the associated labels in
       the  sorted  list  of  labels,  and  '0' everywehere else. Since in general one less dummy
       variable is required than the number of labels, you can remove one column of dummies using
       the option '-d'.

OPTIONS

       -h     print this help

       -c     set the column of labels (default 1)

       -d     which column to remove, counting from 1 (default none)

       -v     print the labels and associated positions to standard error

EXAMPLES

       echo "a 1\nb 2" | gbdummyfy
              create a 4x3 marix with dummy values relative to labels 'a' and 'b'

       This  program  requires  awk  or  gawk.  Notice that it simply expands the data adding new
       columns. When using the resulting the resulting matrix in other utilities, the user should
       specify explicitly which dummies variable to use and how.

       A  simple  linear  dependency can be automatically generated for 'gblreg' by inserting the
       following expression in the functional specification

       `seq 3 12 | sed 's/\(.*\)/\+d\1\*x\1/' | tr -d '\n'`

       and

       `seq 3 12 | sed 's/\(.*\)/,\1=0/' | tr -d '\n'`

       among the initial conditions. In this case there are 10 different values  for  the  dummy.
       They occupy column positions from 3 to 12 and their initial value is zero.

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 © 2009-2015 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.