Mercurial > hg > ltpda

annotate m-toolbox/classes/@ao/dft.m @ 5:5a49956df427 database-connection-manager

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LTPDAPreferences panel for new LTPDADatabaseConnectionManager
author Daniele Nicolodi <nicolodi@science.unitn.it>
date Mon, 05 Dec 2011 16:20:06 +0100
parents f0afece42f48
children
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Daniele Nicolodi <nicolodi@science.unitn.it>
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1 % DFT computes the DFT of the input time-series at the requested frequencies.
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2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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3 %
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4 % DESCRIPTION: DFT computes the DFT of the input time-series at the requested
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5 % frequencies.
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6 %
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7 % CALL: b = dft(a, pl)
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8 %
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9 % <a href="matlab:utils.helper.displayMethodInfo('ao', 'dft')">Parameters Description</a>
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10 %
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11 % VERSION: $Id: dft.m,v 1.29 2011/04/08 08:56:13 hewitson Exp $
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12 %
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13 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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14
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15 function varargout = dft(varargin)
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16
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17 % Check if this is a call for parameters
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18 if utils.helper.isinfocall(varargin{:})
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19 varargout{1} = getInfo(varargin{3});
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20 return
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21 end
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22
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Daniele Nicolodi <nicolodi@science.unitn.it>
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23 import utils.const.*
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24 utils.helper.msg(msg.PROC3, 'running %s/%s', mfilename('class'), mfilename);
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25
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26 % Collect input variable names
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27 in_names = cell(size(varargin));
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28 for ii = 1:nargin,in_names{ii} = inputname(ii);end
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29
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30 % Collect all AOs
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31 [as, ao_invars] = utils.helper.collect_objects(varargin(:), 'ao', in_names);
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32 [pl, pl_invars] = utils.helper.collect_objects(varargin(:), 'plist', in_names);
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33
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34 % Make copies or handles to inputs
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35 bs = copy(as, nargout);
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36
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37 % Combine plists
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38 pl = parse(pl, getDefaultPlist);
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39
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40 % Loop over input AOs
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41 for j=1:numel(bs)
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42 if ~isa(bs(j).data, 'tsdata')
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43 warning('!!! The DFT can only be computed on input time-series. Skipping AO %s', ao_invars{j});
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44 else
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45
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46 % Extract necessary parameters
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47 f = find(pl, 'f');
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48 if isa(f, 'ao') && (isa(f.data, 'fsdata') || isa(f.data, 'xydata'))
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49 f = f.data.getX;
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50 end
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51
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52 % Compute f if necessary
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53 if f == -1
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54 f = linspace(0, bs(j).data.fs/2, length(bs(j).data.getY)/2+1);
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55 end
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56
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57 % Compute DFT
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58 fs = bs(j).data.fs;
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59 N = length(bs(j).data.getY);
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60 J = -2*pi*1i.*[0:N-1]/fs;
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61 dft = zeros(size(f));
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62 for kk = 1:length(f)
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63 dft(kk) = exp(f(kk)*J)*bs(j).data.getY;
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64 end
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65
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66 % Make output fsdata AO
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67 yunits = bs(j).data.yunits;
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68 % Keep the data shape of the input AO
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69 if size(bs(j).data.y,1) ~= 1
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70 f = f.';
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71 dft = dft.';
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72 end
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73 bs(j).data = fsdata(f, dft, bs(j).data.fs);
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74 bs(j).data.setXunits('Hz');
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75 bs(j).data.setYunits(yunits./unit('Hz'));
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76 % Set name
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77 bs(j).name = sprintf('dft(%s)', ao_invars{j});
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78 % Add history
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79 bs(j).addHistory(getInfo('None'), pl, ao_invars(j), bs(j).hist);
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80 % Clear the errors since they don't make sense anymore
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81 clearErrors(bs(j));
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82 end
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83 end
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84
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85
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86 % Set output
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87 if nargout == numel(bs)
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88 % List of outputs
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89 for ii = 1:numel(bs)
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90 varargout{ii} = bs(ii);
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91 end
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92 else
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93 % Single output
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94 varargout{1} = bs;
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95 end
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96 end
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97
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98 %--------------------------------------------------------------------------
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99 % Get Info Object
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100 %--------------------------------------------------------------------------
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101 function ii = getInfo(varargin)
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102 if nargin == 1 && strcmpi(varargin{1}, 'None')
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103 sets = {};
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104 pls = [];
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105 else
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106 sets = {'Default'};
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107 pls = getDefaultPlist;
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108 end
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109 % Build info object
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110 ii = minfo(mfilename, 'ao', 'ltpda', utils.const.categories.sigproc, '$Id: dft.m,v 1.29 2011/04/08 08:56:13 hewitson Exp $', sets, pls);
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111 end
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112
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113 %--------------------------------------------------------------------------
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114 % Get Default Plist
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115 %--------------------------------------------------------------------------
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116
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117 function plout = getDefaultPlist()
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118 persistent pl;
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119 if exist('pl', 'var')==0 || isempty(pl)
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120 pl = buildplist();
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121 end
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122 plout = pl;
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123 end
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124
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125 function pl = buildplist()
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126 pl = plist({'f', ['The vector of frequencies at which to compute the DFT <br>or an AO ' ...
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127 'where the x-axis is taken for the frequency values.']}, paramValue.DOUBLE_VALUE(-1));
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128 end
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129
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130