function bool = isAllZero(x, zerotol)
% determine if all elements of a vector or matrix are close to zero
%
% Syntax: bool = isZeroVector(x, zerotol)
%
% This function returns a logical value that is 'true' if all elements of
%   the vector (or matrix) x are close to zero. For normal floating point 
%   precision, use eps as zerotol.
%
% See also: eps, eliminateRows, isZero

% MDT: MATLAB developement tools
%   Copyright (C) 2012 Alexander Reinhold
%
% This program is free software: you can redistribute it and/or modify it 
%   under the terms of the GNU Lesser General Public License as published 
%   by the Free Software Foundation, either version 3 of the License, or 
%   (at your option) any later version.
%
% 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 
%   Lesser General Public License for more details.
%
% You should have received a copy of the GNU Lesser General Public License 
%   along with this program.  If not, see <http://www.gnu.org/licenses/>.

bool = sum(abs(x(:)) > zerotol) == 0;

end
