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function Op=operatornew(otype,varargin)
%-*- texinfo -*-
%@deftypefn {Function} operatornew
%@verbatim
%OPERATORNEW Construct a new operator
% Usage: F=operatornew(otype,...);
%
% Op=OPERATORNEW(otype,...) constructs a new operator object Op of type
% otype. Arguments following otype are specific to the type of operator
% chosen.
%
% Frame multipliers
% -----------------
%
% OPERATORNEW('framemul',Fa,Fs,s) constructs a frame multiplier with
% analysis frame Fa, synthesis frame Fs and symbol s. See the help on
% FRAMEMUL.
%
% Spreading operators
% -------------------
%
% OPERATORNEW('spread',s) constructs a spreading operator with symbol
% s. See the help on SPREADOP.
%
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/operators/operatornew.html}
%@seealso{operator, ioperator}
%@end deftypefn
% Copyright (C) 2005-2016 Peter L. Soendergaard <peter@sonderport.dk>.
% This file is part of LTFAT version 2.3.1
%
% 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/>.
if nargin<2
error('%s: Too few input parameters.',upper(mfilename));
end;
if ~ischar(otype)
error(['%s: First agument must be a string denoting the type of ' ...
'frame.'],upper(mfilename));
end;
otype=lower(otype);
switch(otype)
case 'framemul'
Op.Fa=varargin{1};
Op.Fs=varargin{2};
Op.s =varargin{3};
Op.L =framelengthcoef(Op.Fs,size(Op.s,1));
case 'spread'
Op.s =varargin{1};
Op.L =length(Op.s);
otherwise
error('%s: Unknows operator type: %s',upper(mfilename),otype);
end;
Op.type=otype;
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