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  42.         <a href="echonest-module.html">Package&nbsp;echonest</a> ::
    43. 

  43.         Module&nbsp;sorting
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  52.             >[<a href="frames.html" target="_top">frames</a
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  53.             >]&nbsp;|&nbsp;<a href="echonest.sorting-module.html"
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  54.             target="_top">no&nbsp;frames</a>]</span></td></tr>
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    59. 

  59. <!-- ==================== MODULE DESCRIPTION ==================== -->
    60. 

  60. <h1 class="epydoc">Module sorting</h1><p class="nomargin-top"><span class="codelink"><a href="echonest.sorting-pysrc.html">source&nbsp;code</a></span></p>
    61. 

  61. <p>Sorting key functions as utilities for <a href="echonest.audio-module.html" class="link">echonest.audio</a>.</p>
    62. 

  62. <p>For convenience, intended to be imported as:</p>
    63. 

  63. <pre class="rst-literal-block">
    64. 

  64. from audio.sorting import *
    65. 

  65. </pre>
    66. 

  66. <p>All of the functions in this module can be used as a sorting key for
    67. 

  67. <code class="link">AudioQuantumList.ordered_by</code>, as in:</p>
    68. 

  68. <pre class="rst-literal-block">
    69. 

  69. analysis.segments.ordered_by(duration)
    70. 

  70. </pre>
    71. 

  71. <p>Some of the functions in this module return <em>another</em> function that takes
    72. 

  72. one argument, an <a href="echonest.audio.AudioQuantum-class.html" class="link">AudioQuantum</a>, and returns a value (typically a <code class="link">float</code>)
    73. 

  73. that can then be used as a sorting value.</p>
    74. 

  74. <p>By convention, all of these functions are named to be noun phrases that
    75. 

  75. follow <code class="link">sorted_by</code>, as seen above.</p>
    76. 

  76. 

  77. <!-- ==================== FUNCTIONS ==================== -->
    78. 

  78. <a name="section-Functions"></a>
    79. 

  79. <table class="summary" border="1" cellpadding="3"
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  80.        cellspacing="0" width="100%" bgcolor="white">
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  81. <tr bgcolor="#70b0f0" class="table-header">
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  82.   <td colspan="2" class="table-header">
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  83.     <table border="0" cellpadding="0" cellspacing="0" width="100%">
    84. 

  84.       <tr valign="top">
    85. 

  85.         <td align="left"><span class="table-header">Functions</span></td>
    86. 

  86.         <td align="right" valign="top"
    87. 

  87.          ><span class="options">[<a href="#section-Functions"
    88. 

  88.          class="privatelink" onclick="toggle_private();"
    89. 

  89.          >hide private</a>]</span></td>
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  90.       </tr>
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  91.     </table>
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  92.   </td>
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  93. </tr>
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  94. <tr>
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  95.     <td width="15%" align="right" valign="top" class="summary">
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  96.       <span class="summary-type">&nbsp;</span>
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  97.     </td><td class="summary">
    98. 

  98.       <table width="100%" cellpadding="0" cellspacing="0" border="0">
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  99.         <tr>
    100. 

  100.           <td><span class="summary-sig"><a name="confidence"></a><span class="summary-sig-name">confidence</span>(<span class="summary-sig-arg">x</span>)</span><br />
    101. 

  101.       Returns the <a href="echonest.audio.AudioQuantum-class.html" class="link">AudioQuantum</a>'s <a href="echonest.sorting-module.html#confidence" class="link">confidence</a> as a sorting value.</td>
    102. 

  102.           <td align="right" valign="top">
    103. 

  103.             <span class="codelink"><a href="echonest.sorting-pysrc.html#confidence">source&nbsp;code</a></span>
    104. 

  104.             
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  105.           </td>
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  107.       </table>
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  108.       
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  109.     </td>
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  112.     <td width="15%" align="right" valign="top" class="summary">
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  113.       <span class="summary-type">&nbsp;</span>
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  114.     </td><td class="summary">
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  115.       <table width="100%" cellpadding="0" cellspacing="0" border="0">
    116. 

  116.         <tr>
    117. 

  117.           <td><span class="summary-sig"><a name="duration"></a><span class="summary-sig-name">duration</span>(<span class="summary-sig-arg">x</span>)</span><br />
    118. 

  118.       Returns the <a href="echonest.audio.AudioQuantum-class.html" class="link">AudioQuantum</a>'s <a href="echonest.sorting-module.html#duration" class="link">duration</a> as a sorting value.</td>
    119. 

  119.           <td align="right" valign="top">
    120. 

  120.             <span class="codelink"><a href="echonest.sorting-pysrc.html#duration">source&nbsp;code</a></span>
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  121.             
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  125.       
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  128. <tr>
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  129.     <td width="15%" align="right" valign="top" class="summary">
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  130.       <span class="summary-type">&nbsp;</span>
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  131.     </td><td class="summary">
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  132.       <table width="100%" cellpadding="0" cellspacing="0" border="0">
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  133.         <tr>
    134. 

  134.           <td><span class="summary-sig"><a href="echonest.sorting-module.html#timbre_value" class="summary-sig-name">timbre_value</a>(<span class="summary-sig-arg">index</span>)</span><br />
    135. 

  135.       Returns a function that returns the value of <code class="link">timbre</code>[<em>index</em>]
    136. 

  136. of its input <a href="echonest.audio.AudioQuantum-class.html" class="link">AudioQuantum</a>.</td>
    137. 

  137.           <td align="right" valign="top">
    138. 

  138.             <span class="codelink"><a href="echonest.sorting-pysrc.html#timbre_value">source&nbsp;code</a></span>
    139. 

  139.             
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  140.           </td>
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  141.         </tr>
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  142.       </table>
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  143.       
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  144.     </td>
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  145.   </tr>
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  146. <tr>
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  147.     <td width="15%" align="right" valign="top" class="summary">
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  148.       <span class="summary-type">&nbsp;</span>
    149. 

  149.     </td><td class="summary">
    150. 

  150.       <table width="100%" cellpadding="0" cellspacing="0" border="0">
    151. 

  151.         <tr>
    152. 

  152.           <td><span class="summary-sig"><a href="echonest.sorting-module.html#pitch_value" class="summary-sig-name">pitch_value</a>(<span class="summary-sig-arg">index</span>)</span><br />
    153. 

  153.       Returns a function that returns the value of <code class="link">pitch</code>[<em>index</em>]
    154. 

  154. of its input <a href="echonest.audio.AudioQuantum-class.html" class="link">AudioQuantum</a>.</td>
    155. 

  155.           <td align="right" valign="top">
    156. 

  156.             <span class="codelink"><a href="echonest.sorting-pysrc.html#pitch_value">source&nbsp;code</a></span>
    157. 

  157.             
    158. 

  158.           </td>
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  159.         </tr>
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  160.       </table>
    161. 

  161.       
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  162.     </td>
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  163.   </tr>
    164. 

  164. <tr>
    165. 

  165.     <td width="15%" align="right" valign="top" class="summary">
    166. 

  166.       <span class="summary-type">&nbsp;</span>
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  167.     </td><td class="summary">
    168. 

  168.       <table width="100%" cellpadding="0" cellspacing="0" border="0">
    169. 

  169.         <tr>
    170. 

  170.           <td><span class="summary-sig"><a href="echonest.sorting-module.html#pitch_distance_from" class="summary-sig-name">pitch_distance_from</a>(<span class="summary-sig-arg">seg</span>)</span><br />
    171. 

  171.       Returns a function that returns the sum of the squared differences
    172. 

  172. between the <code class="link">pitch</code> vector of its input <a href="echonest.audio.AudioQuantum-class.html" class="link">AudioQuantum</a> and the <code class="link">pitch</code>
    173. 

  173. vector of the reference parameter <em>seg</em>.</td>
    174. 

  174.           <td align="right" valign="top">
    175. 

  175.             <span class="codelink"><a href="echonest.sorting-pysrc.html#pitch_distance_from">source&nbsp;code</a></span>
    176. 

  176.             
    177. 

  177.           </td>
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  178.         </tr>
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  179.       </table>
    180. 

  180.       
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  181.     </td>
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  182.   </tr>
    183. 

  183. <tr>
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  184.     <td width="15%" align="right" valign="top" class="summary">
    185. 

  185.       <span class="summary-type">&nbsp;</span>
    186. 

  186.     </td><td class="summary">
    187. 

  187.       <table width="100%" cellpadding="0" cellspacing="0" border="0">
    188. 

  188.         <tr>
    189. 

  189.           <td><span class="summary-sig"><a href="echonest.sorting-module.html#timbre_distance_from" class="summary-sig-name">timbre_distance_from</a>(<span class="summary-sig-arg">seg</span>)</span><br />
    190. 

  190.       Returns a function that returns the sum of the squared differences
    191. 

  191. between the <code class="link">pitch</code> vector of its input <a href="echonest.audio.AudioQuantum-class.html" class="link">AudioQuantum</a> and the <code class="link">pitch</code>
    192. 

  192. vector of the reference parameter <em>seg</em>.</td>
    193. 

  193.           <td align="right" valign="top">
    194. 

  194.             <span class="codelink"><a href="echonest.sorting-pysrc.html#timbre_distance_from">source&nbsp;code</a></span>
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  195.             
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  196.           </td>
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    199. 

  199.       
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  203.     <td width="15%" align="right" valign="top" class="summary">
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  204.       <span class="summary-type">&nbsp;</span>
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  205.     </td><td class="summary">
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  206.       <table width="100%" cellpadding="0" cellspacing="0" border="0">
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  207.         <tr>
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  208.           <td><span class="summary-sig"><a href="echonest.sorting-module.html#noisiness" class="summary-sig-name">noisiness</a>(<span class="summary-sig-arg">x</span>)</span><br />
    209. 

  209.       Returns the sum of the twelve pitch vectors' elements.</td>
    210. 

  210.           <td align="right" valign="top">
    211. 

  211.             <span class="codelink"><a href="echonest.sorting-pysrc.html#noisiness">source&nbsp;code</a></span>
    212. 

  212.             
    213. 

  213.           </td>
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  215.       </table>
    216. 

  216.       
    217. 

  217.     </td>
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  218.   </tr>
    219. 

  219. <tr class="private">
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  220.     <td width="15%" align="right" valign="top" class="summary">
    221. 

  221.       <span class="summary-type">&nbsp;</span>
    222. 

  222.     </td><td class="summary">
    223. 

  223.       <table width="100%" cellpadding="0" cellspacing="0" border="0">
    224. 

  224.         <tr>
    225. 

  225.           <td><span class="summary-sig"><a href="echonest.sorting-module.html#_diff_squared" class="summary-sig-name" onclick="show_private();">_diff_squared</a>(<span class="summary-sig-arg">a</span>,
    226. 

  226.         <span class="summary-sig-arg">b</span>)</span><br />
    227. 

  227.       Local helper function.</td>
    228. 

  228.           <td align="right" valign="top">
    229. 

  229.             <span class="codelink"><a href="echonest.sorting-pysrc.html#_diff_squared">source&nbsp;code</a></span>
    230. 

  230.             
    231. 

  231.           </td>
    232. 

  232.         </tr>
    233. 

  233.       </table>
    234. 

  234.       
    235. 

  235.     </td>
    236. 

  236.   </tr>
    237. 

  237. </table>
    238. 

  238. <!-- ==================== VARIABLES ==================== -->
    239. 

  239. <a name="section-Variables"></a>
    240. 

  240. <table class="summary" border="1" cellpadding="3"
    241. 

  241.        cellspacing="0" width="100%" bgcolor="white">
    242. 

  242. <tr bgcolor="#70b0f0" class="table-header">
    243. 

  243.   <td colspan="2" class="table-header">
    244. 

  244.     <table border="0" cellpadding="0" cellspacing="0" width="100%">
    245. 

  245.       <tr valign="top">
    246. 

  246.         <td align="left"><span class="table-header">Variables</span></td>
    247. 

  247.         <td align="right" valign="top"
    248. 

  248.          ><span class="options">[<a href="#section-Variables"
    249. 

  249.          class="privatelink" onclick="toggle_private();"
    250. 

  250.          >hide private</a>]</span></td>
    251. 

  251.       </tr>
    252. 

  252.     </table>
    253. 

  253.   </td>
    254. 

  254. </tr>
    255. 

  255. <tr>
    256. 

  256.     <td width="15%" align="right" valign="top" class="summary">
    257. 

  257.       <span class="summary-type">&nbsp;</span>
    258. 

  258.     </td><td class="summary">
    259. 

  259.         <a name="__package__"></a><span class="summary-name">__package__</span> = <code title="None">None</code><br />
    260. 

  260.       hash(x)
    261. 

  261.     </td>
    262. 

  262.   </tr>
    263. 

  263. </table>
    264. 

  264. <!-- ==================== FUNCTION DETAILS ==================== -->
    265. 

  265. <a name="section-FunctionDetails"></a>
    266. 

  266. <table class="details" border="1" cellpadding="3"
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  267.        cellspacing="0" width="100%" bgcolor="white">
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  268. <tr bgcolor="#70b0f0" class="table-header">
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  269.   <td colspan="2" class="table-header">
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  270.     <table border="0" cellpadding="0" cellspacing="0" width="100%">
    271. 

  271.       <tr valign="top">
    272. 

  272.         <td align="left"><span class="table-header">Function Details</span></td>
    273. 

  273.         <td align="right" valign="top"
    274. 

  274.          ><span class="options">[<a href="#section-FunctionDetails"
    275. 

  275.          class="privatelink" onclick="toggle_private();"
    276. 

  276.          >hide private</a>]</span></td>
    277. 

  277.       </tr>
    278. 

  278.     </table>
    279. 

  279.   </td>
    280. 

  280. </tr>
    281. 

  281. </table>
    282. 

  282. <a name="timbre_value"></a>
    283. 

  283. <div>
    284. 

  284. <table class="details" border="1" cellpadding="3"
    285. 

  285.        cellspacing="0" width="100%" bgcolor="white">
    286. 

  286. <tr><td>
    287. 

  287.   <table width="100%" cellpadding="0" cellspacing="0" border="0">
    288. 

  288.   <tr valign="top"><td>
    289. 

  289.   <h3 class="epydoc"><span class="sig"><span class="sig-name">timbre_value</span>(<span class="sig-arg">index</span>)</span>
    290. 

  290.   </h3>
    291. 

  291.   </td><td align="right" valign="top"
    292. 

  292.     ><span class="codelink"><a href="echonest.sorting-pysrc.html#timbre_value">source&nbsp;code</a></span>&nbsp;
    293. 

  293.     </td>
    294. 

  294.   </tr></table>
    295. 

  295.   
    296. 

  296.   Returns a function that returns the value of <code class="link">timbre</code>[<em>index</em>]
    297. 

  297. of its input <a href="echonest.audio.AudioQuantum-class.html" class="link">AudioQuantum</a>. Sorts by the values of the <em>index</em>-th
    298. 

  298. value in the timbre vector.
    299. 

  299.   <dl class="fields">
    300. 

  300.   </dl>
    301. 

  301. </td></tr></table>
    302. 

  302. </div>
    303. 

  303. <a name="pitch_value"></a>
    304. 

  304. <div>
    305. 

  305. <table class="details" border="1" cellpadding="3"
    306. 

  306.        cellspacing="0" width="100%" bgcolor="white">
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  307. <tr><td>
    308. 

  308.   <table width="100%" cellpadding="0" cellspacing="0" border="0">
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  309.   <tr valign="top"><td>
    310. 

  310.   <h3 class="epydoc"><span class="sig"><span class="sig-name">pitch_value</span>(<span class="sig-arg">index</span>)</span>
    311. 

  311.   </h3>
    312. 

  312.   </td><td align="right" valign="top"
    313. 

  313.     ><span class="codelink"><a href="echonest.sorting-pysrc.html#pitch_value">source&nbsp;code</a></span>&nbsp;
    314. 

  314.     </td>
    315. 

  315.   </tr></table>
    316. 

  316.   
    317. 

  317.   Returns a function that returns the value of <code class="link">pitch</code>[<em>index</em>]
    318. 

  318. of its input <a href="echonest.audio.AudioQuantum-class.html" class="link">AudioQuantum</a>. Sorts by the values of the <em>index</em>-th
    319. 

  319. value in the pitch vector.
    320. 

  320.   <dl class="fields">
    321. 

  321.   </dl>
    322. 

  322. </td></tr></table>
    323. 

  323. </div>
    324. 

  324. <a name="pitch_distance_from"></a>
    325. 

  325. <div>
    326. 

  326. <table class="details" border="1" cellpadding="3"
    327. 

  327.        cellspacing="0" width="100%" bgcolor="white">
    328. 

  328. <tr><td>
    329. 

  329.   <table width="100%" cellpadding="0" cellspacing="0" border="0">
    330. 

  330.   <tr valign="top"><td>
    331. 

  331.   <h3 class="epydoc"><span class="sig"><span class="sig-name">pitch_distance_from</span>(<span class="sig-arg">seg</span>)</span>
    332. 

  332.   </h3>
    333. 

  333.   </td><td align="right" valign="top"
    334. 

  334.     ><span class="codelink"><a href="echonest.sorting-pysrc.html#pitch_distance_from">source&nbsp;code</a></span>&nbsp;
    335. 

  335.     </td>
    336. 

  336.   </tr></table>
    337. 

  337.   
    338. 

  338.   Returns a function that returns the sum of the squared differences
    339. 

  339. between the <code class="link">pitch</code> vector of its input <a href="echonest.audio.AudioQuantum-class.html" class="link">AudioQuantum</a> and the <code class="link">pitch</code>
    340. 

  340. vector of the reference parameter <em>seg</em>. Sorts by the pitch distance
    341. 

  341. from the reference <a href="echonest.audio.AudioSegment-class.html" class="link">AudioSegment</a>.
    342. 

  342.   <dl class="fields">
    343. 

  343.   </dl>
    344. 

  344. </td></tr></table>
    345. 

  345. </div>
    346. 

  346. <a name="timbre_distance_from"></a>
    347. 

  347. <div>
    348. 

  348. <table class="details" border="1" cellpadding="3"
    349. 

  349.        cellspacing="0" width="100%" bgcolor="white">
    350. 

  350. <tr><td>
    351. 

  351.   <table width="100%" cellpadding="0" cellspacing="0" border="0">
    352. 

  352.   <tr valign="top"><td>
    353. 

  353.   <h3 class="epydoc"><span class="sig"><span class="sig-name">timbre_distance_from</span>(<span class="sig-arg">seg</span>)</span>
    354. 

  354.   </h3>
    355. 

  355.   </td><td align="right" valign="top"
    356. 

  356.     ><span class="codelink"><a href="echonest.sorting-pysrc.html#timbre_distance_from">source&nbsp;code</a></span>&nbsp;
    357. 

  357.     </td>
    358. 

  358.   </tr></table>
    359. 

  359.   
    360. 

  360.   Returns a function that returns the sum of the squared differences
    361. 

  361. between the <code class="link">pitch</code> vector of its input <a href="echonest.audio.AudioQuantum-class.html" class="link">AudioQuantum</a> and the <code class="link">pitch</code>
    362. 

  362. vector of the reference parameter <em>seg</em>. Sorts by the pitch distance
    363. 

  363. from the reference <a href="echonest.audio.AudioSegment-class.html" class="link">AudioSegment</a>.
    364. 

  364.   <dl class="fields">
    365. 

  365.   </dl>
    366. 

  366. </td></tr></table>
    367. 

  367. </div>
    368. 

  368. <a name="noisiness"></a>
    369. 

  369. <div>
    370. 

  370. <table class="details" border="1" cellpadding="3"
    371. 

  371.        cellspacing="0" width="100%" bgcolor="white">
    372. 

  372. <tr><td>
    373. 

  373.   <table width="100%" cellpadding="0" cellspacing="0" border="0">
    374. 

  374.   <tr valign="top"><td>
    375. 

  375.   <h3 class="epydoc"><span class="sig"><span class="sig-name">noisiness</span>(<span class="sig-arg">x</span>)</span>
    376. 

  376.   </h3>
    377. 

  377.   </td><td align="right" valign="top"
    378. 

  378.     ><span class="codelink"><a href="echonest.sorting-pysrc.html#noisiness">source&nbsp;code</a></span>&nbsp;
    379. 

  379.     </td>
    380. 

  380.   </tr></table>
    381. 

  381.   
    382. 

  382.   Returns the sum of the twelve pitch vectors' elements. This is a very
    383. 

  383. fast way of judging the relative noisiness of a segment.
    384. 

  384.   <dl class="fields">
    385. 

  385.   </dl>
    386. 

  386. </td></tr></table>
    387. 

  387. </div>
    388. 

  388. <a name="_diff_squared"></a>
    389. 

  389. <div class="private">
    390. 

  390. <table class="details" border="1" cellpadding="3"
    391. 

  391.        cellspacing="0" width="100%" bgcolor="white">
    392. 

  392. <tr><td>
    393. 

  393.   <table width="100%" cellpadding="0" cellspacing="0" border="0">
    394. 

  394.   <tr valign="top"><td>
    395. 

  395.   <h3 class="epydoc"><span class="sig"><span class="sig-name">_diff_squared</span>(<span class="sig-arg">a</span>,
    396. 

  396.         <span class="sig-arg">b</span>)</span>
    397. 

  397.   </h3>
    398. 

  398.   </td><td align="right" valign="top"
    399. 

  399.     ><span class="codelink"><a href="echonest.sorting-pysrc.html#_diff_squared">source&nbsp;code</a></span>&nbsp;
    400. 

  400.     </td>
    401. 

  401.   </tr></table>
    402. 

  402.   
    403. 

  403.   Local helper function. The square of the difference between a and b.
    404. 

  404.   <dl class="fields">
    405. 

  405.   </dl>
    406. 

  406. </td></tr></table>
    407. 

  407. </div>
    408. 

  408. <br />
    409. 

  409. <!-- ==================== NAVIGATION BAR ==================== -->
    410. 

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    415. 

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    416. 

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  418.   <!-- Index link -->
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    420. 

  420.         href="identifier-index.html">Indices</a>&nbsp;&nbsp;&nbsp;</th>
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    432. 

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    433. 

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    437. 

  437.     Generated by Epydoc 3.0.1 on Wed Sep  1 16:08:57 2010
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    441. 

  441.         >http://epydoc.sourceforge.net</a>
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    444. 

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    445. 

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    447. 

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    448. 

  448.   // Private objects are initially displayed (because if
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  449.   // javascript is turned off then we want them to be
    450. 

  450.   // visible); but by default, we want to hide them.  So hide
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