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group__BasicScale.html 21 KB
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    113. 

  113. <div class="title">Vector Scale<div class="ingroups"><a class="el" href="group__groupMath.html">Basic Math Functions</a></div></div>  </div>
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    117. 

  117. <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
    118. 

  118. Functions</h2></td></tr>
    119. 

  119. <tr class="memitem:ga5e769c8e22da173674c6abca7291e713"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__BasicScale.html#ga5e769c8e22da173674c6abca7291e713">arm_scale_f32</a> (const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *pSrc, <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> scale, <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *pDst, uint32_t <a class="el" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>)</td></tr>
    120. 

  120. <tr class="memdesc:ga5e769c8e22da173674c6abca7291e713"><td class="mdescLeft">&#160;</td><td class="mdescRight">Multiplies a floating-point vector by a scalar.  <a href="#ga5e769c8e22da173674c6abca7291e713">More...</a><br/></td></tr>
    121. 

  121. <tr class="separator:ga5e769c8e22da173674c6abca7291e713"><td class="memSeparator" colspan="2">&#160;</td></tr>
    122. 

  122. <tr class="memitem:ga4663809f04249df5ea186ea09335e687"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__BasicScale.html#ga4663809f04249df5ea186ea09335e687">arm_scale_q15</a> (const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *pSrc, <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> scaleFract, int8_t shift, <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *pDst, uint32_t <a class="el" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>)</td></tr>
    123. 

  123. <tr class="memdesc:ga4663809f04249df5ea186ea09335e687"><td class="mdescLeft">&#160;</td><td class="mdescRight">Multiplies a Q15 vector by a scalar.  <a href="#ga4663809f04249df5ea186ea09335e687">More...</a><br/></td></tr>
    124. 

  124. <tr class="separator:ga4663809f04249df5ea186ea09335e687"><td class="memSeparator" colspan="2">&#160;</td></tr>
    125. 

  125. <tr class="memitem:ga8b2b6ea2e39ca464e8f2cfdd937c022b"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__BasicScale.html#ga8b2b6ea2e39ca464e8f2cfdd937c022b">arm_scale_q31</a> (const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *pSrc, <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> scaleFract, int8_t shift, <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *pDst, uint32_t <a class="el" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>)</td></tr>
    126. 

  126. <tr class="memdesc:ga8b2b6ea2e39ca464e8f2cfdd937c022b"><td class="mdescLeft">&#160;</td><td class="mdescRight">Multiplies a Q31 vector by a scalar.  <a href="#ga8b2b6ea2e39ca464e8f2cfdd937c022b">More...</a><br/></td></tr>
    127. 

  127. <tr class="separator:ga8b2b6ea2e39ca464e8f2cfdd937c022b"><td class="memSeparator" colspan="2">&#160;</td></tr>
    128. 

  128. <tr class="memitem:ga0d135086c6b813251b47a0d127b75eb8"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__BasicScale.html#ga0d135086c6b813251b47a0d127b75eb8">arm_scale_q7</a> (const <a class="el" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263">q7_t</a> *pSrc, <a class="el" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263">q7_t</a> scaleFract, int8_t shift, <a class="el" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263">q7_t</a> *pDst, uint32_t <a class="el" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>)</td></tr>
    129. 

  129. <tr class="memdesc:ga0d135086c6b813251b47a0d127b75eb8"><td class="mdescLeft">&#160;</td><td class="mdescRight">Multiplies a Q7 vector by a scalar.  <a href="#ga0d135086c6b813251b47a0d127b75eb8">More...</a><br/></td></tr>
    130. 

  130. <tr class="separator:ga0d135086c6b813251b47a0d127b75eb8"><td class="memSeparator" colspan="2">&#160;</td></tr>
    131. 

  131. </table>
    132. 

  132. <a name="details" id="details"></a><h2 class="groupheader">Description</h2>
    133. 

  133. <p>Multiply a vector by a scalar value. For floating-point data, the algorithm used is:</p>
    134. 

  134. <pre>
    135. 

  135.     pDst[n] = pSrc[n] * scale,   0 &lt;= n &lt; blockSize.
    136. 

  136. </pre><p>In the fixed-point Q7, Q15, and Q31 functions, <code>scale</code> is represented by a fractional multiplication <code>scaleFract</code> and an arithmetic shift <code>shift</code>. The shift allows the gain of the scaling operation to exceed 1.0. The algorithm used with fixed-point data is:</p>
    137. 

  137. <pre>
    138. 

  138.     pDst[n] = (pSrc[n] * scaleFract) &lt;&lt; shift,   0 &lt;= n &lt; blockSize.
    139. 

  139. </pre><p>The overall scale factor applied to the fixed-point data is </p>
    140. 

  140. <pre>
    141. 

  141.     scale = scaleFract * 2^shift.
    142. 

  142. </pre><p>The functions support in-place computation allowing the source and destination pointers to reference the same memory buffer. </p>
    143. 

  143. <h2 class="groupheader">Function Documentation</h2>
    144. 

  144. <a class="anchor" id="ga5e769c8e22da173674c6abca7291e713"></a>
    145. 

  145. <div class="memitem">
    146. 

  146. <div class="memproto">
    147. 

  147.       <table class="memname">
    148. 

  148.         <tr>
    149. 

  149.           <td class="memname">void arm_scale_f32 </td>
    150. 

  150.           <td>(</td>
    151. 

  151.           <td class="paramtype">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *&#160;</td>
    152. 

  152.           <td class="paramname"><em>pSrc</em>, </td>
    153. 

  153.         </tr>
    154. 

  154.         <tr>
    155. 

  155.           <td class="paramkey"></td>
    156. 

  156.           <td></td>
    157. 

  157.           <td class="paramtype"><a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a>&#160;</td>
    158. 

  158.           <td class="paramname"><em>scale</em>, </td>
    159. 

  159.         </tr>
    160. 

  160.         <tr>
    161. 

  161.           <td class="paramkey"></td>
    162. 

  162.           <td></td>
    163. 

  163.           <td class="paramtype"><a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *&#160;</td>
    164. 

  164.           <td class="paramname"><em>pDst</em>, </td>
    165. 

  165.         </tr>
    166. 

  166.         <tr>
    167. 

  167.           <td class="paramkey"></td>
    168. 

  168.           <td></td>
    169. 

  169.           <td class="paramtype">uint32_t&#160;</td>
    170. 

  170.           <td class="paramname"><em>blockSize</em>&#160;</td>
    171. 

  171.         </tr>
    172. 

  172.         <tr>
    173. 

  173.           <td></td>
    174. 

  174.           <td>)</td>
    175. 

  175.           <td></td><td></td>
    176. 

  176.         </tr>
    177. 

  177.       </table>
    178. 

  178. </div><div class="memdoc">
    179. 

  179. <dl class="params"><dt>Parameters</dt><dd>
    180. 

  180.   <table class="params">
    181. 

  181.     <tr><td class="paramdir">[in]</td><td class="paramname">pSrc</td><td>points to the input vector </td></tr>
    182. 

  182.     <tr><td class="paramdir">[in]</td><td class="paramname">scale</td><td>scale factor to be applied </td></tr>
    183. 

  183.     <tr><td class="paramdir">[out]</td><td class="paramname">pDst</td><td>points to the output vector </td></tr>
    184. 

  184.     <tr><td class="paramdir">[in]</td><td class="paramname">blockSize</td><td>number of samples in each vector </td></tr>
    185. 

  185.   </table>
    186. 

  186.   </dd>
    187. 

  187. </dl>
    188. 

  188. <dl class="section return"><dt>Returns</dt><dd>none </dd></dl>
    189. 

  189. 

  190. </div>
    191. 

  191. </div>
    192. 

  192. <a class="anchor" id="ga4663809f04249df5ea186ea09335e687"></a>
    193. 

  193. <div class="memitem">
    194. 

  194. <div class="memproto">
    195. 

  195.       <table class="memname">
    196. 

  196.         <tr>
    197. 

  197.           <td class="memname">void arm_scale_q15 </td>
    198. 

  198.           <td>(</td>
    199. 

  199.           <td class="paramtype">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *&#160;</td>
    200. 

  200.           <td class="paramname"><em>pSrc</em>, </td>
    201. 

  201.         </tr>
    202. 

  202.         <tr>
    203. 

  203.           <td class="paramkey"></td>
    204. 

  204.           <td></td>
    205. 

  205.           <td class="paramtype"><a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a>&#160;</td>
    206. 

  206.           <td class="paramname"><em>scaleFract</em>, </td>
    207. 

  207.         </tr>
    208. 

  208.         <tr>
    209. 

  209.           <td class="paramkey"></td>
    210. 

  210.           <td></td>
    211. 

  211.           <td class="paramtype">int8_t&#160;</td>
    212. 

  212.           <td class="paramname"><em>shift</em>, </td>
    213. 

  213.         </tr>
    214. 

  214.         <tr>
    215. 

  215.           <td class="paramkey"></td>
    216. 

  216.           <td></td>
    217. 

  217.           <td class="paramtype"><a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *&#160;</td>
    218. 

  218.           <td class="paramname"><em>pDst</em>, </td>
    219. 

  219.         </tr>
    220. 

  220.         <tr>
    221. 

  221.           <td class="paramkey"></td>
    222. 

  222.           <td></td>
    223. 

  223.           <td class="paramtype">uint32_t&#160;</td>
    224. 

  224.           <td class="paramname"><em>blockSize</em>&#160;</td>
    225. 

  225.         </tr>
    226. 

  226.         <tr>
    227. 

  227.           <td></td>
    228. 

  228.           <td>)</td>
    229. 

  229.           <td></td><td></td>
    230. 

  230.         </tr>
    231. 

  231.       </table>
    232. 

  232. </div><div class="memdoc">
    233. 

  233. <dl class="params"><dt>Parameters</dt><dd>
    234. 

  234.   <table class="params">
    235. 

  235.     <tr><td class="paramdir">[in]</td><td class="paramname">pSrc</td><td>points to the input vector </td></tr>
    236. 

  236.     <tr><td class="paramdir">[in]</td><td class="paramname">scaleFract</td><td>fractional portion of the scale value </td></tr>
    237. 

  237.     <tr><td class="paramdir">[in]</td><td class="paramname">shift</td><td>number of bits to shift the result by </td></tr>
    238. 

  238.     <tr><td class="paramdir">[out]</td><td class="paramname">pDst</td><td>points to the output vector </td></tr>
    239. 

  239.     <tr><td class="paramdir">[in]</td><td class="paramname">blockSize</td><td>number of samples in each vector </td></tr>
    240. 

  240.   </table>
    241. 

  241.   </dd>
    242. 

  242. </dl>
    243. 

  243. <dl class="section return"><dt>Returns</dt><dd>none</dd></dl>
    244. 

  244. <dl class="section user"><dt>Scaling and Overflow Behavior</dt><dd>The input data <code>*pSrc</code> and <code>scaleFract</code> are in 1.15 format. These are multiplied to yield a 2.30 intermediate result and this is shifted with saturation to 1.15 format. </dd></dl>
    245. 

  245. 

  246. </div>
    247. 

  247. </div>
    248. 

  248. <a class="anchor" id="ga8b2b6ea2e39ca464e8f2cfdd937c022b"></a>
    249. 

  249. <div class="memitem">
    250. 

  250. <div class="memproto">
    251. 

  251.       <table class="memname">
    252. 

  252.         <tr>
    253. 

  253.           <td class="memname">void arm_scale_q31 </td>
    254. 

  254.           <td>(</td>
    255. 

  255.           <td class="paramtype">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *&#160;</td>
    256. 

  256.           <td class="paramname"><em>pSrc</em>, </td>
    257. 

  257.         </tr>
    258. 

  258.         <tr>
    259. 

  259.           <td class="paramkey"></td>
    260. 

  260.           <td></td>
    261. 

  261.           <td class="paramtype"><a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a>&#160;</td>
    262. 

  262.           <td class="paramname"><em>scaleFract</em>, </td>
    263. 

  263.         </tr>
    264. 

  264.         <tr>
    265. 

  265.           <td class="paramkey"></td>
    266. 

  266.           <td></td>
    267. 

  267.           <td class="paramtype">int8_t&#160;</td>
    268. 

  268.           <td class="paramname"><em>shift</em>, </td>
    269. 

  269.         </tr>
    270. 

  270.         <tr>
    271. 

  271.           <td class="paramkey"></td>
    272. 

  272.           <td></td>
    273. 

  273.           <td class="paramtype"><a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *&#160;</td>
    274. 

  274.           <td class="paramname"><em>pDst</em>, </td>
    275. 

  275.         </tr>
    276. 

  276.         <tr>
    277. 

  277.           <td class="paramkey"></td>
    278. 

  278.           <td></td>
    279. 

  279.           <td class="paramtype">uint32_t&#160;</td>
    280. 

  280.           <td class="paramname"><em>blockSize</em>&#160;</td>
    281. 

  281.         </tr>
    282. 

  282.         <tr>
    283. 

  283.           <td></td>
    284. 

  284.           <td>)</td>
    285. 

  285.           <td></td><td></td>
    286. 

  286.         </tr>
    287. 

  287.       </table>
    288. 

  288. </div><div class="memdoc">
    289. 

  289. <dl class="params"><dt>Parameters</dt><dd>
    290. 

  290.   <table class="params">
    291. 

  291.     <tr><td class="paramdir">[in]</td><td class="paramname">pSrc</td><td>points to the input vector </td></tr>
    292. 

  292.     <tr><td class="paramdir">[in]</td><td class="paramname">scaleFract</td><td>fractional portion of the scale value </td></tr>
    293. 

  293.     <tr><td class="paramdir">[in]</td><td class="paramname">shift</td><td>number of bits to shift the result by </td></tr>
    294. 

  294.     <tr><td class="paramdir">[out]</td><td class="paramname">pDst</td><td>points to the output vector </td></tr>
    295. 

  295.     <tr><td class="paramdir">[in]</td><td class="paramname">blockSize</td><td>number of samples in each vector </td></tr>
    296. 

  296.   </table>
    297. 

  297.   </dd>
    298. 

  298. </dl>
    299. 

  299. <dl class="section return"><dt>Returns</dt><dd>none</dd></dl>
    300. 

  300. <dl class="section user"><dt>Scaling and Overflow Behavior</dt><dd>The input data <code>*pSrc</code> and <code>scaleFract</code> are in 1.31 format. These are multiplied to yield a 2.62 intermediate result and this is shifted with saturation to 1.31 format. </dd></dl>
    301. 

  301. 

  302. </div>
    303. 

  303. </div>
    304. 

  304. <a class="anchor" id="ga0d135086c6b813251b47a0d127b75eb8"></a>
    305. 

  305. <div class="memitem">
    306. 

  306. <div class="memproto">
    307. 

  307.       <table class="memname">
    308. 

  308.         <tr>
    309. 

  309.           <td class="memname">void arm_scale_q7 </td>
    310. 

  310.           <td>(</td>
    311. 

  311.           <td class="paramtype">const <a class="el" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263">q7_t</a> *&#160;</td>
    312. 

  312.           <td class="paramname"><em>pSrc</em>, </td>
    313. 

  313.         </tr>
    314. 

  314.         <tr>
    315. 

  315.           <td class="paramkey"></td>
    316. 

  316.           <td></td>
    317. 

  317.           <td class="paramtype"><a class="el" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263">q7_t</a>&#160;</td>
    318. 

  318.           <td class="paramname"><em>scaleFract</em>, </td>
    319. 

  319.         </tr>
    320. 

  320.         <tr>
    321. 

  321.           <td class="paramkey"></td>
    322. 

  322.           <td></td>
    323. 

  323.           <td class="paramtype">int8_t&#160;</td>
    324. 

  324.           <td class="paramname"><em>shift</em>, </td>
    325. 

  325.         </tr>
    326. 

  326.         <tr>
    327. 

  327.           <td class="paramkey"></td>
    328. 

  328.           <td></td>
    329. 

  329.           <td class="paramtype"><a class="el" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263">q7_t</a> *&#160;</td>
    330. 

  330.           <td class="paramname"><em>pDst</em>, </td>
    331. 

  331.         </tr>
    332. 

  332.         <tr>
    333. 

  333.           <td class="paramkey"></td>
    334. 

  334.           <td></td>
    335. 

  335.           <td class="paramtype">uint32_t&#160;</td>
    336. 

  336.           <td class="paramname"><em>blockSize</em>&#160;</td>
    337. 

  337.         </tr>
    338. 

  338.         <tr>
    339. 

  339.           <td></td>
    340. 

  340.           <td>)</td>
    341. 

  341.           <td></td><td></td>
    342. 

  342.         </tr>
    343. 

  343.       </table>
    344. 

  344. </div><div class="memdoc">
    345. 

  345. <dl class="params"><dt>Parameters</dt><dd>
    346. 

  346.   <table class="params">
    347. 

  347.     <tr><td class="paramdir">[in]</td><td class="paramname">pSrc</td><td>points to the input vector </td></tr>
    348. 

  348.     <tr><td class="paramdir">[in]</td><td class="paramname">scaleFract</td><td>fractional portion of the scale value </td></tr>
    349. 

  349.     <tr><td class="paramdir">[in]</td><td class="paramname">shift</td><td>number of bits to shift the result by </td></tr>
    350. 

  350.     <tr><td class="paramdir">[out]</td><td class="paramname">pDst</td><td>points to the output vector </td></tr>
    351. 

  351.     <tr><td class="paramdir">[in]</td><td class="paramname">blockSize</td><td>number of samples in each vector </td></tr>
    352. 

  352.   </table>
    353. 

  353.   </dd>
    354. 

  354. </dl>
    355. 

  355. <dl class="section return"><dt>Returns</dt><dd>none</dd></dl>
    356. 

  356. <dl class="section user"><dt>Scaling and Overflow Behavior</dt><dd>The input data <code>*pSrc</code> and <code>scaleFract</code> are in 1.7 format. These are multiplied to yield a 2.14 intermediate result and this is shifted with saturation to 1.7 format. </dd></dl>
    357. 

  357. 

  358. </div>
    359. 

  359. </div>
    360. 

  360. </div><!-- contents -->
    361. 

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    362. 

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