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author Daniele Nicolodi <nicolodi@science.unitn.it>
date Mon, 05 Dec 2011 16:20:06 +0100
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1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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2 "http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
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3
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4 <html lang="en">
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5 <head>
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6 <meta name="generator" content=
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7 "HTML Tidy for Mac OS X (vers 1st December 2004), see www.w3.org">
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8 <meta http-equiv="Content-Type" content=
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9 "text/html; charset=us-ascii">
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10
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11 <title>Select and find data from an AO (LTPDA Toolbox)</title>
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12 <link rel="stylesheet" href="docstyle.css" type="text/css">
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13 <meta name="generator" content="DocBook XSL Stylesheets V1.52.2">
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14 <meta name="description" content=
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15 "Presents an overview of the features, system requirements, and starting the toolbox.">
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16 </head>
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18 <body>
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19 <a name="top_of_page" id="top_of_page"></a>
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20
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21 <p style="font-size:1px;">&nbsp;</p>
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22
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23 <table class="nav" summary="Navigation aid" border="0" width=
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24 "100%" cellpadding="0" cellspacing="0">
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25 <tr>
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26 <td valign="baseline"><b>LTPDA Toolbox</b></td><td><a href="../helptoc.html">contents</a></td>
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27
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28 <td valign="baseline" align="right"><a href=
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29 "ltpda_training_topic_2_6.html"><img src="b_prev.gif" border="0" align=
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30 "bottom" alt="Whitening noise"></a>&nbsp;&nbsp;&nbsp;<a href=
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31 "ltpda_training_topic_2_8.html"><img src="b_next.gif" border="0" align=
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32 "bottom" alt="Split and join AOs"></a></td>
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33 </tr>
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34 </table>
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35
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36 <h1 class="title"><a name="f3-12899" id="f3-12899"></a>Select and find data from an AO</h1>
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37 <hr>
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38
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39 <p>
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40
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41 <p>
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42 LTPDA contains a set of methods that can be used for the selection of data from an AO. In this section
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43 we will in particular look at <tt>ao/find</tt> and <tt>ao/select</tt>.
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44 </p>
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45 <p>
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46 We will start by generating a sine wave:
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47 </p>
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48 <div class="fragment"><pre>
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49 pl = plist(<span class="string">'waveform'</span>, <span class="string">'sine wave'</span>, <span class="string">'f'</span>, 1, <span class="string">'fs'</span>, 100, <span class="string">'nsecs'</span>, 10, <span class="string">'yunits'</span>, <span class="string">'V'</span>);
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50 a = ao(pl)
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51 </pre></div>
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52
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53 <br>
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54 <h2>Example 1 - using <tt>find</tt></h2>
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55 <p>
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56 Now let us use the <tt>find</tt> method to extract parts of the data we are interested in.
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57 </p>
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58 <p>
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59 The <tt>find</tt> method can take a parameter 'query' for defining which data points you want to find. The
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60 query string can be any valid MATLAB logical expression, and in particular can be expressed in terms of the
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61 x and y data of the input AO.
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62 </p>
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63 <p>
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64 In this example, we want to find all x values between 3 and 6. The following code does just that:
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65 </p>
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66 <div class="fragment"><pre>
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67 a_find = find(a, plist(<span class="string">'query'</span>, <span class="string">'x&gt;3 &amp; x&lt;6'</span>));
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68 iplot(a, a_find)
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69 </pre></div>
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70 <img src="images/ltpda_training_1/topic2/find.png" alt="find" border="1">
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71 <br>
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72 <h2>Example 2 - using <tt>select</tt></h2>
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73 <p>
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74 The <tt>select</tt> method lets us select a set of data samples from our AO.
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75 For this we need a <tt>plist</tt> containing an array of samples we want to select.
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76 We take our sine wave again which is stored in the variable <tt>a</tt> to see how it works.
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77 </p>
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78 <div class="fragment"><pre>
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79 a_select = select(a, plist(<span class="string">'samples'</span>, 200:800));
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80 iplot(a, a_select)
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81 </pre></div>
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82 <img src="images/ltpda_training_1/topic2/select.png" alt="select" border="1">
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83
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84 </p>
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85
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86 <br>
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87 <br>
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88 <table class="nav" summary="Navigation aid" border="0" width=
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89 "100%" cellpadding="0" cellspacing="0">
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90 <tr valign="top">
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91 <td align="left" width="20"><a href="ltpda_training_topic_2_6.html"><img src=
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92 "b_prev.gif" border="0" align="bottom" alt=
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93 "Whitening noise"></a>&nbsp;</td>
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94
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95 <td align="left">Whitening noise</td>
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96
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97 <td>&nbsp;</td>
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98
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99 <td align="right">Split and join AOs</td>
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100
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101 <td align="right" width="20"><a href=
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102 "ltpda_training_topic_2_8.html"><img src="b_next.gif" border="0" align=
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103 "bottom" alt="Split and join AOs"></a></td>
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104 </tr>
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105 </table><br>
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106
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107 <p class="copy">&copy;LTP Team</p>
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108 </body>
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109 </html>