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- ## Copyright (C) 1996 Auburn University. All Rights Reserved
- ##
- ## 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 USA.
-
- ## -*- texinfo -*-
- ## @deftypefn {Function File } { @var{retval} =} freqchkw ( @var{w} )
- ## Used by @code{freqresp} to check that input frequency vector @var{w} is legal.
- ## Returns boolean value.
- ## @end deftypefn
-
- function USEW = freqchkw (w)
-
- ## A S Hodel July 1996
-
- if(isempty(w))
- USEW = 0;
- elseif(!is_vector(w))
- error(["w (",num2str(rows(w)),"x",num2str(columns(w)), ...
- "): must be [], a vector or a scalar"]);
- elseif( (max(abs(imag(w))) != 0) && (min(real(w)) <= 0) )
- error("w must have real positive entries");
- else
- w = sort(w);
- USEW = 1; # vector provided (check values later)
- endif
- endfunction
-