function f = uminus(f)
%UMINUS   Unary minus of a CHEBTECH.
%   UMINUS(F) is the negative of F.

% Copyright 2017 by The University of Oxford and The Chebfun Developers. 
% See http://www.chebfun.org/ for Chebfun information.

% Negate the coefficients:
f.coeffs = -f.coeffs;

end
