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function outsig=operatoreigs(Op,K,varargin);
%-*- texinfo -*-
%@deftypefn {Function} operatoreigs
%@verbatim
%OPERATOREIGS Apply the adjoint of an operator
% Usage: c=operatoreigs(Op,K);
%
% [V,D]=OPERATOREIGS(Op,K) computes the K largest eigenvalues and
% eigenvectors of the operator Op to the input signal f. The operator
% object Op must have been created using OPERATORNEW.
%
% If K is empty, then all eigenvalues/pairs will be returned.
%
% D=OPERATOREIGS(...) computes only the eigenvalues.
%
% OPERATOREIGS takes the following parameters at the end of the line of input
% arguments:
%
% 'tol',t Stop if relative residual error is less than the
% specified tolerance. Default is 1e-9
%
% 'maxit',n Do at most n iterations.
%
% 'iter' Call eigs to use an iterative algorithm.
%
% 'full' Call eig to solve the full problem.
%
% 'auto' Use the full method for small problems and the
% iterative method for larger problems. This is the
% default.
%
% 'crossover',c
% Set the problem size for which the 'auto' method
% switches. Default is 200.
%
% 'print' Display the progress.
%
% 'quiet' Don't print anything, this is the default.
%
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/operators/operatoreigs.html}
%@seealso{operatornew, 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 ~isstruct(Op)
error('%s: First argument must be a operator definition structure.',upper(mfilename));
end;
switch(Op.type)
case 'framemul'
outsig=framemuleigs(Op.Fa,Op.Fs,Op.s,K,varargin{:});
case 'spread'
outsig=spreadeigs(K,Op.s);
end;
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