function bool = isZero(x, zerotol)
% determine if a scalar, vector or matrix is close to zero
%
% Syntax: bool = isZero(x, zerotol)
%
% This function returns a logical matrix of the same size whose elements 
%   are 1 if the elements of the input matrix (or vector, or scalar) is 
%   close to zero. For normal floating point precision, use eps as zerotol.
%
% See also: eps, isAllZero, eliminateRows

% 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 = abs(x) <= zerotol;

end
