--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/m-toolbox/classes/@ao/fft.m	Wed Nov 23 19:22:13 2011 +0100
@@ -0,0 +1,104 @@
+% FFT overloads the fft method for Analysis objects.
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% DESCRIPTION: FFT overloads the fft operator for Analysis objects.
+%
+% CALL:        b = fft(a, pl)
+%
+% PARAMETERS:  'type'  - plain, one or two sided fft [default: 'plain']
+%
+% <a href="matlab:utils.helper.displayMethodInfo('ao', 'fft')">Parameters Description</a>
+%
+% VERSION:     $Id: fft.m,v 1.50 2011/04/28 21:31:31 mauro Exp $
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+function varargout = fft(varargin)
+
+  % Check if this is a call for parameters
+  if utils.helper.isinfocall(varargin{:})
+    varargout{1} = getInfo(varargin{3});
+    return
+  end
+
+  import utils.const.*
+  utils.helper.msg(msg.PROC3, 'running %s/%s', mfilename('class'), mfilename);
+
+  % Collect input variable names
+  in_names = cell(size(varargin));
+  for ii = 1:nargin,in_names{ii} = inputname(ii);end
+
+  % Collect all AOs
+  [as, ao_invars] = utils.helper.collect_objects(varargin(:), 'ao', in_names);
+
+  % Decide on a deep copy or a modify
+  bs = copy(as, nargout);
+
+  % Apply defaults to plist
+  pl = applyDefaults(getDefaultPlist, varargin{:});
+
+  % two-sided or one?
+  type = find(pl, 'type');
+  
+  % scale?
+  scale = utils.prog.yes2true(find(pl, 'scale'));
+  
+  % Check input analysis object
+  for jj = 1:numel(bs)
+    % call core method of the fft
+    bs(jj).fft_core(type);
+    % scale if desired
+    if scale
+        bs(jj) = bs(jj)./ao(plist('vals',as(jj).fs,'yunits','Hz'));
+    end
+    % set name
+    bs(jj).name = sprintf('fft(%s)', ao_invars{jj});
+    % Add history
+    bs(jj).addHistory(getInfo('None'), pl, ao_invars(jj), bs(jj).hist);
+  end
+
+  % Set output
+  varargout = utils.helper.setoutputs(nargout, bs);
+end
+
+%--------------------------------------------------------------------------
+% Get Info Object
+%--------------------------------------------------------------------------
+function ii = getInfo(varargin)
+  if nargin == 1 && strcmpi(varargin{1}, 'None')
+    sets = {};
+    pl   = [];
+  else
+    sets = {'Default'};
+    pl   = getDefaultPlist();
+  end
+  % Build info object
+  ii = minfo(mfilename, 'ao', 'ltpda', utils.const.categories.sigproc, '$Id: fft.m,v 1.50 2011/04/28 21:31:31 mauro Exp $', sets, pl);
+end
+
+%--------------------------------------------------------------------------
+% Get Default Plist
+%--------------------------------------------------------------------------
+function plout = getDefaultPlist()
+  persistent pl;  
+  if ~exist('pl', 'var') || isempty(pl)
+    pl = buildplist();
+  end
+  plout = pl;  
+end
+
+function plo = buildplist()
+  plo = plist();
+
+  % FFT Type
+  p = plist({'type', 'The fft type. Plain (complete non-symmetric), One-sided (from zero to Nyquist) or two-sided (complete symmetric).'}, {2, {'plain', 'one', 'two'}, paramValue.SINGLE});
+  plo.append(p);
+  
+  % Scale by sample rate?
+  p = param({'scale',['set to ''true'' to scale FFT by sampling rate to match '...
+      'amplitude in continuous domain. Only applicable to time-series AOs.']},...
+      paramValue.FALSE_TRUE);  
+  
+  plo.append(p);
+
+end