Mercurial > hg > ltpda

annotate m-toolbox/classes/@ao/downsample.m @ 32:e22b091498e4 database-connection-manager

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Update makeToolbox
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 % DOWNSAMPLE AOs containing time-series data.
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Daniele Nicolodi <nicolodi@science.unitn.it>
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2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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3 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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4 % DESCRIPTION: DOWNSAMPLE AOs containing time-series data. All other AOs with
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Daniele Nicolodi <nicolodi@science.unitn.it>
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5 % no time-series data are skipped but appear in the output.
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Daniele Nicolodi <nicolodi@science.unitn.it>
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6 % Note that no anti-aliasing filter is applied to the
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Daniele Nicolodi <nicolodi@science.unitn.it>
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7 % original data!!!
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Daniele Nicolodi <nicolodi@science.unitn.it>
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8 % CALL: b = downsample(a, pl) - use plist to get parameters
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Daniele Nicolodi <nicolodi@science.unitn.it>
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9 % b = downsample(a1, a2, pl) - downsample both a1 and a2;
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10 % b is then a 2x1 vector.
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11 %
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12 % <a href="matlab:utils.helper.displayMethodInfo('ao', 'downsample')">Parameters Description</a>
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13 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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14 % EXAMPLES: 1) downsample x4; offset is set to default of 0
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15 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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16 % >> p = plist('factor',4);
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17 % >> b = downsample(a, p);
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18 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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19 % 2) downsample x2 with 1 sample offset
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20 %
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21 % >> p = plist('factor',2,'offset',1);
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22 % >> b = downsample(a,p);
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23 %
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24 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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25 % VERSION: $Id: downsample.m,v 1.34 2011/07/14 05:33:18 mauro Exp $
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26 %
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27 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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28
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29 function varargout = downsample(varargin)
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30
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31 % Check if this is a call for parameters
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Daniele Nicolodi <nicolodi@science.unitn.it>
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32 if utils.helper.isinfocall(varargin{:})
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Daniele Nicolodi <nicolodi@science.unitn.it>
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33 varargout{1} = getInfo(varargin{3});
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Daniele Nicolodi <nicolodi@science.unitn.it>
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34 return
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Daniele Nicolodi <nicolodi@science.unitn.it>
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35 end
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36
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Daniele Nicolodi <nicolodi@science.unitn.it>
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37 import utils.const.*
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Daniele Nicolodi <nicolodi@science.unitn.it>
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38 utils.helper.msg(msg.PROC3, 'running %s/%s', mfilename('class'), mfilename);
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39
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Daniele Nicolodi <nicolodi@science.unitn.it>
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40 % Collect input variable names
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Daniele Nicolodi <nicolodi@science.unitn.it>
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41 in_names = cell(size(varargin));
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Daniele Nicolodi <nicolodi@science.unitn.it>
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42 for ii = 1:nargin,in_names{ii} = inputname(ii);end
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43
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Daniele Nicolodi <nicolodi@science.unitn.it>
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44 % Collect all AOs
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45 [as, ao_invars] = utils.helper.collect_objects(varargin(:), 'ao', in_names);
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46 [pl, pl_invars] = utils.helper.collect_objects(varargin(:), 'plist', in_names);
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47
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Daniele Nicolodi <nicolodi@science.unitn.it>
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48 % Decide on a deep copy or a modify
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Daniele Nicolodi <nicolodi@science.unitn.it>
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49 bs = copy(as, nargout);
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50
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Daniele Nicolodi <nicolodi@science.unitn.it>
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51 % Combine plists
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52 pl = parse(pl, getDefaultPlist);
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53
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54 % Get parameters from plist
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55 offset = find(pl, 'offset');
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Daniele Nicolodi <nicolodi@science.unitn.it>
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56 factor = find(pl, 'factor');
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57
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58 % Checking downsampling value is valid
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59 if isempty(factor)
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60 error('### Please give a plist with a parameter ''Factor''.');
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61 end
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62
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63 % Checking downsampling value is integer
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64 if rem(factor, floor(factor)) ~= 0
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Daniele Nicolodi <nicolodi@science.unitn.it>
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65 warning('!!! Downsample factor should be an integer. Rounding. !!!');
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66 factor = round(factor);
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67 end
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68
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69 % Checking sample offset value
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70 if isempty(offset)
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71 warning('!!! No offset specified; using default of 0 samples !!!');
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72 offset = 0;
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73 end
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74
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75 if factor == 0
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76 error('### The downsampling factor is zero. Please set a positive integer value.');
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77 end
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78
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79 % Loop over input AOs
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Daniele Nicolodi <nicolodi@science.unitn.it>
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80 for jj = 1:numel(bs)
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Daniele Nicolodi <nicolodi@science.unitn.it>
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81 if isa(bs(jj).data, 'tsdata')
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Daniele Nicolodi <nicolodi@science.unitn.it>
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82 % get samples
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Daniele Nicolodi <nicolodi@science.unitn.it>
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83 ss = 1+offset;
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84 samples = ss:factor:length(bs(jj).data.y);
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Daniele Nicolodi <nicolodi@science.unitn.it>
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85 % select samples
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86 bs(jj).data.setXY(bs(jj).data.getX(samples), bs(jj).data.getY(samples));
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87 % Set new sample rate
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88 bs(jj).data.setFs(bs(jj).data.fs/factor);
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89 % drop X vector again if we can
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90 bs(jj).data.collapseX;
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91 % set name
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92 bs(jj).name = sprintf('downsample(%s)', ao_invars{jj});
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Daniele Nicolodi <nicolodi@science.unitn.it>
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93 % Add history
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94 bs(jj).addHistory(getInfo('None'), pl, ao_invars(jj), bs(jj).hist);
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Daniele Nicolodi <nicolodi@science.unitn.it>
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95 % Clear the errors since they don't make sense anymore
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Daniele Nicolodi <nicolodi@science.unitn.it>
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96 clearErrors(bs(jj));
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Daniele Nicolodi <nicolodi@science.unitn.it>
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97 else
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98 warning('!!! Downsample only works on tsdata objects. Skipping AO %s', ao_invars{jj});
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99 end
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100 end
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101
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Daniele Nicolodi <nicolodi@science.unitn.it>
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102 % Set output
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103 varargout = utils.helper.setoutputs(nargout, bs);
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104 end
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105
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106 %--------------------------------------------------------------------------
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107 % Get Info Object
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108 %--------------------------------------------------------------------------
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109 function ii = getInfo(varargin)
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110 if nargin == 1 && strcmpi(varargin{1}, 'None')
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111 sets = {};
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112 pl = [];
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113 else
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114 sets = {'Default'};
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115 pl = getDefaultPlist;
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116 end
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Daniele Nicolodi <nicolodi@science.unitn.it>
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117 % Build info object
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118 ii = minfo(mfilename, 'ao', 'ltpda', utils.const.categories.sigproc, '$Id: downsample.m,v 1.34 2011/07/14 05:33:18 mauro Exp $', sets, pl);
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119 end
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120
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121 %--------------------------------------------------------------------------
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Daniele Nicolodi <nicolodi@science.unitn.it>
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122 % Get Default Plist
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123 %--------------------------------------------------------------------------
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124
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125 function plout = getDefaultPlist()
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126 persistent pl;
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127 if ~exist('pl', 'var') || isempty(pl)
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128 pl = buildplist();
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129 end
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130 plout = pl;
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131 end
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132
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Daniele Nicolodi <nicolodi@science.unitn.it>
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133 function pl = buildplist()
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134
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135 pl = plist();
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136
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Daniele Nicolodi <nicolodi@science.unitn.it>
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137 % Factor
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138 p = param({'factor', 'The decimation factor. Should be an integer.'}, {1, {1}, paramValue.OPTIONAL});
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139 pl.append(p);
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140
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141 % Offset
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142 p = param({'offset', 'The sample offset used in the decimation.'}, {1, {0}, paramValue.OPTIONAL});
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143 pl.append(p);
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Daniele Nicolodi <nicolodi@science.unitn.it>
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144
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145 end
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146
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147