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Update ltpda_uo.update
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 <p>
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2 The use of LTPDA objects requires some understanding of the nature of objects as implemented in MATLAB.
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3 </p>
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4 <p>
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5 For full details of objects in MATLAB, refer to <a href="matlab:web(['jar:file:///' matlabroot '/help/techdoc/help.jar!/matlab_oop/ug_intropage.html'])">MATLAB Classes and Object-Oriented Programming</a>.
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6 For convenience, the most important aspects in the context of LTPDA are reviewed below.
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7 </p>
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8 <p>
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9 <ul>
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10 <li>
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11 <p><a href="objects_working.html#calling">Calling object methods</a></p>
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12 </li>
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13 <li>
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14 <p><a href="objects_working.html#set">Setting object properties</a></p>
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15 </li>
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16 <li>
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17 <p><a href="objects_working.html#copy">Copying objects</a></p>
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18 </li>
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19 <li><a href="objects_working.html#exploring">Exploring objects</a></li>
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20 </ul>
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21 </p>
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22
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23 <a name="calling" id= "calling"><h3 class="title">Calling object methods</h3></a>
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24
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25 <p>
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26 Each class in LTPDA has a set of methods (functions) which can operate/act on instances of the class (objects).
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27 For example, the AO class has a method <tt>psd</tt> which can compute the Power Spectral Density estimate of a
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28 time-series AO.
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29 </p>
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30 <p>
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31 To see which methods a particular class has, use the <tt>methods</tt> command. For example,
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32 <div class="fragment"><pre>
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33 >> methods(<span class="string">'ao'</span>)
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34 </pre></div>
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35 </p>
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36 <p>
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37 To call a method on an object, <tt>obj.method</tt>, or, <tt>method(obj)</tt>. For example,
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38 <div class="fragment"><pre>
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39 >> b = a.psd
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40 </pre></div>
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41 or
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42 <div class="fragment"><pre>
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43 >> b = psd(a)
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44 </pre></div>
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45 Additional arguments can be passed to the method (a <tt>plist</tt>, for example), as follows:
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46 <div class="fragment"><pre>
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47 >> b = a.psd(pl)
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48 </pre></div>
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49 or
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50 <div class="fragment"><pre>
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51 >> b = psd(a, pl)
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52 </pre></div>
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53 </p><br>
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54 <p>
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55 In order to pass multiple objects to a method, you must use the form
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56 <div class="fragment"><pre>
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57 >> b = psd(a1, a2, pl)
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58 </pre></div>
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59 </p><br>
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60 <p>
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61 Some methods can behave as modifiers which means that the object which the method acts on is modified. To
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62 modify an object, just give no output. If we start with a time-series AO then modify it with the <tt>psd</tt>
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63 method,
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64 <div class="fragment"><pre>
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65 >> a = ao(1:100, randn(100,1), 10)
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66 >> a
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67 M: running ao/display
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68 ----------- ao 01: a -----------
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69
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70 name: None
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71 data: (0,0.840375529753905) (0.1,-0.88803208232901) (0.2,0.100092833139322) (0.3,-0.544528929990548) (0.4,0.303520794649354) ...
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72 -------- tsdata 01 ------------
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73
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74 fs: 10
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75 x: [100 1], double
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76 y: [100 1], double
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77 dx: [0 0], double
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78 dy: [0 0], double
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79 xunits: [s]
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80 yunits: []
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81 nsecs: 10
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82 t0: 1970-01-01 00:00:01.000
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83 -------------------------------
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84
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85 hist: ao / ao / SId: fromVals ... -->$Id: ao .... S
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86 mdlfile: empty
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87 description:
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88 UUID: 8cffab46-61f0-494a-af03-eb310aa76114
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89 --------------------------------
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90 </pre></div><br>
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91 Then call the <tt>psd</tt> method:
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92 <div class="fragment"><pre>
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93 >> a.psd
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94 M: running ao/psd
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95 M: running ao/len
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96 M: running ao/len
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97 M: running ao/display
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98 ----------- ao 01: PSD(a) -----------
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99
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100 name: PSD(a)
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101 data: (0,0.117412356146407) (0.1,0.179893990497347) (0.2,0.173957816470448) (0.3,0.245076068355785) (0.4,0.213036543621994) ...
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102 ----------- fsdata 01 -----------
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103
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104 fs: 10
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105 x: [51 1], double
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106 y: [51 1], double
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107 dx: [0 0], double
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108 dy: [0 0], double
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109 xunits: [Hz]
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110 yunits: [Hz^(-1)]
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111 t0: 1970-01-01 00:00:01.000
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112 navs: 1
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113 ---------------------------------
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114
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115 hist: ao / psd / SId: psd.m,v 1.52 2009/09/05 05:57:32 mauro Exp S
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116 mdlfile: empty
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117 description:
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118 UUID: 0d2395cd-22af-4645-a94c-69fa32c15982
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119 -------------------------------------
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120 </pre></div><br>
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121 then the object <tt>a</tt> is converted to a frequency-series AO.
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122 </p><br>
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123 <p>
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124 This modifier behaviour only works with certain methods, in particular, methods requiring more than one input object
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125 will not behave as modifiers.
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126 </p><br>
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127 <a name="set" id= "set"><h3 class="title">Setting object properties</h3></a>
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128 <p>
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129 All object properties must be set using the appropriate setter method. For example, to set the name of a IIR filter
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130 object,
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131 <div class="fragment"><pre>
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132 >> ii = miir();
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133 >> ii.setName(<span class="string">'My Filter'</span>);
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134 </pre></div>
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135 </p>
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136 <p>
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137 Reading the value of a property is achieved by:
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138 <div class="fragment"><pre>
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139 >> ii.name
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140
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141 ans =
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142
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143 My Filter
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144 </pre></div>
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145 </p><br>
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146
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147 <a name="copy" id= "copy"><h3 class="title">Copying objects</h3></a>
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148 <br>
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149 <p>
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150 Since all objects in LTPDA are handle objects, creating copies of objects needs to be done differently than in standard
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151 MATLAB. For example,
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152 <div class="fragment"><pre>
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153 >> a = ao();
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154 >> b = a;
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155 </pre></div>
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156 in this case, the variable <tt>b</tt> is a copy of the handle <tt>a</tt>, not a copy of the object pointed too
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157 by the handle <tt>a</tt>. To see how this behaves,
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158 <div class="fragment"><pre>
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159 >> a = ao();
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160 >> b = a;
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161 >> b.setName(<span class="string">'My Name'</span>);
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162 >> a.name
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163
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164 ans =
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165
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166 My Name
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167 </pre></div>
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168 </p>
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169 <p>
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170 Copying the object can be achieved using the copy constructor:
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171 <div class="fragment"><pre>
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172 >> a = ao();
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173 >> b = ao(a);
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174 >> b.setName(<span class="string">'My Name'</span>);
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175 >> a.name
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176
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177 ans =
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178
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179 none
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180 </pre></div>
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181 <p>In this case, the variable <tt>b</tt> points to a new distinct copy of the object pointed to by <tt>a</tt>.
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182 </p>
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183 </p>
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184 <p></p>
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185 <h3 class="title"><a name="exploring" id="calling2">Exploring objects</a></h3>
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186 <p> A browsing tool is provided on purpose to enable LTPDA objects exploring.</p>
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187 <p><a href="gui_explorer.html">See the LTPDA Objects Explorer GUI documentation.</a></p>