### Copyright (C) 1996 Kurt Hornik
### 
### This file is part of Octave.
###
### Octave is free software; you can redistribute it and/or modify it
### under the terms of the GNU General Public License as published by
### the Free Software Foundation; either version 2, or (at your option)
### any later version.
###
### Octave 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.
###
### You should have received a copy of the GNU General Public License
### along with Octave; see the file COPYING.  If not, write to the Free
### Software Foundation, 59 Temple Place - Suite 330, Boston, MA
### 02111-1307, USA.

## usage:  bin2dec (x)
##
## Returns the decimal number corresponding to the binary number in
## quotes.  For example, bin2dec ("1110") returns 14.

function y = bin2dec (x)

## Original version by Kurt Hornik <Kurt.Hornik@ci.tuwien.ac.at>.
  
  if (nargin != 1)
    usage ("bin2dec (x)");
  endif

  x = toascii (x) - toascii ("0");

  if (all (x == 0 | x == 1))
    y = sum ((x .* (ones (rows (x), 1) * 2.^((length (x) - 1) : -1 : 0)))')';
  else
    error ("bin2dec: argument must be a string of zeros and ones");
  endif
  
endfunction