function h = frameoperator(F, f);
%FRAMEOPERATOR Frame Operator
% Usage: o=frameoperator(F, f);
%
% Input parameters:
% F : frame
% f : input vector
%
% Output parameter:
% h : output vector
%
% h=FRAMEOPERATOR(F,f) applies the frame operator associated with the frame
% F to the input f.
%
% If the frame F is a tight frame, then h equals f up to the constant
% frac{1}{A} where A is the lower frame bound of F. If the frame F*
% is an orthonormal basis, or more general a Parseval frame, then h equals
% f.
%
%
% Url: http://ltfat.github.io/doc/frames/frameoperator.html
% Copyright (C) 2005-2023 Peter L. Soendergaard <peter@sonderport.dk> and others.
% This file is part of LTFAT version 2.6.0
%
% This program 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 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 General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this program. If not, see <http://www.gnu.org/licenses/>.
% AUTHOR: Jordy van Velthoven
complainif_notenoughargs(nargin, 2, 'FRAMEOPERATOR');
h = frsyn(F, (frana(F,f)));