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<div class="title">arm_variance_example_f32.c</div>  </div>
</div><!--header-->
<div class="contents">
<div class="fragment"><div class="line"><span class="comment">/* ----------------------------------------------------------------------</span></div>
<div class="line"><span class="comment">* Copyright (C) 2010-2012 ARM Limited. All rights reserved.</span></div>
<div class="line"><span class="comment">*</span></div>
<div class="line"><span class="comment">* $Date:         17. January 2013</span></div>
<div class="line"><span class="comment">* $Revision:     V1.4.0</span></div>
<div class="line"><span class="comment">*</span></div>
<div class="line"><span class="comment">* Project:       CMSIS DSP Library</span></div>
<div class="line"><span class="comment">* Title:         arm_variance_example_f32.c</span></div>
<div class="line"><span class="comment">*</span></div>
<div class="line"><span class="comment">* Description:   Example code demonstrating variance calculation of input sequence.</span></div>
<div class="line"><span class="comment">*</span></div>
<div class="line"><span class="comment">* Target Processor: Cortex-M4/Cortex-M3</span></div>
<div class="line"><span class="comment">*</span></div>
<div class="line"><span class="comment">* Redistribution and use in source and binary forms, with or without</span></div>
<div class="line"><span class="comment">* modification, are permitted provided that the following conditions</span></div>
<div class="line"><span class="comment">* are met:</span></div>
<div class="line"><span class="comment">*   - Redistributions of source code must retain the above copyright</span></div>
<div class="line"><span class="comment">*     notice, this list of conditions and the following disclaimer.</span></div>
<div class="line"><span class="comment">*   - Redistributions in binary form must reproduce the above copyright</span></div>
<div class="line"><span class="comment">*     notice, this list of conditions and the following disclaimer in</span></div>
<div class="line"><span class="comment">*     the documentation and/or other materials provided with the</span></div>
<div class="line"><span class="comment">*     distribution.</span></div>
<div class="line"><span class="comment">*   - Neither the name of ARM LIMITED nor the names of its contributors</span></div>
<div class="line"><span class="comment">*     may be used to endorse or promote products derived from this</span></div>
<div class="line"><span class="comment">*     software without specific prior written permission.</span></div>
<div class="line"><span class="comment">*</span></div>
<div class="line"><span class="comment">* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS</span></div>
<div class="line"><span class="comment">* &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT</span></div>
<div class="line"><span class="comment">* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS</span></div>
<div class="line"><span class="comment">* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE</span></div>
<div class="line"><span class="comment">* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,</span></div>
<div class="line"><span class="comment">* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,</span></div>
<div class="line"><span class="comment">* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;</span></div>
<div class="line"><span class="comment">* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER</span></div>
<div class="line"><span class="comment">* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT</span></div>
<div class="line"><span class="comment">* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN</span></div>
<div class="line"><span class="comment">* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE</span></div>
<div class="line"><span class="comment">* POSSIBILITY OF SUCH DAMAGE.</span></div>
<div class="line"><span class="comment">* -------------------------------------------------------------------- */</span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#include &lt;math.h&gt;</span></div>
<div class="line"><span class="preprocessor">#include &quot;<a class="code" href="arm__math_8h.html">arm_math.h</a>&quot;</span></div>
<div class="line"></div>
<div class="line"><span class="comment">/* ----------------------------------------------------------------------</span></div>
<div class="line"><span class="comment">* Defines each of the tests performed</span></div>
<div class="line"><span class="comment">* ------------------------------------------------------------------- */</span></div>
<div class="line"><span class="preprocessor">#define MAX_BLOCKSIZE   32</span></div>
<div class="line"><span class="preprocessor"></span><span class="preprocessor">#define DELTA           (0.000001f)</span></div>
<div class="line"><span class="preprocessor"></span></div>
<div class="line"></div>
<div class="line"><span class="comment">/* ----------------------------------------------------------------------</span></div>
<div class="line"><span class="comment">* Declare I/O buffers</span></div>
<div class="line"><span class="comment">* ------------------------------------------------------------------- */</span></div>
<div class="line"><a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> <a name="a0"></a><a class="code" href="arm__variance__example__f32_8c.html#acc43b372d92d5027b9f9cac782c8b3c7">wire1</a>[<a name="a1"></a><a class="code" href="arm__variance__example__f32_8c.html#af8a1d2ed31f7c9a00fec46a798edb61b">MAX_BLOCKSIZE</a>];</div>
<div class="line"><a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> <a name="a2"></a><a class="code" href="arm__variance__example__f32_8c.html#a41a9afab5be5ccd2e6f618b83102f0d1">wire2</a>[<a class="code" href="arm__variance__example__f32_8c.html#af8a1d2ed31f7c9a00fec46a798edb61b">MAX_BLOCKSIZE</a>];</div>
<div class="line"><a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> <a name="a3"></a><a class="code" href="arm__variance__example__f32_8c.html#af61f43ad332a2322e43ced590b6d9768">wire3</a>[<a class="code" href="arm__variance__example__f32_8c.html#af8a1d2ed31f7c9a00fec46a798edb61b">MAX_BLOCKSIZE</a>];</div>
<div class="line"></div>
<div class="line"><span class="comment">/* ----------------------------------------------------------------------</span></div>
<div class="line"><span class="comment">* Test input data for Floating point Variance example for 32-blockSize</span></div>
<div class="line"><span class="comment">* Generated by the MATLAB randn() function</span></div>
<div class="line"><span class="comment">* ------------------------------------------------------------------- */</span></div>
<div class="line"></div>
<div class="line"><a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> <a name="a4"></a><a class="code" href="arm__variance__example__f32_8c.html#a9170ec9e681e2b519fe9c46a30455841">testInput_f32</a>[32] =</div>
<div class="line">{</div>
<div class="line">  -0.432564811528221,  -1.665584378238097,   0.125332306474831,   0.287676420358549,</div>
<div class="line">  -1.146471350681464,   1.190915465642999,   1.189164201652103,  -0.037633276593318,</div>
<div class="line">   0.327292361408654,   0.174639142820925,  -0.186708577681439,   0.725790548293303,</div>
<div class="line">  -0.588316543014189,   2.183185818197101,  -0.136395883086596,   0.113931313520810,</div>
<div class="line">   1.066768211359189,   0.059281460523605,  -0.095648405483669,  -0.832349463650022,</div>
<div class="line">   0.294410816392640,  -1.336181857937804,   0.714324551818952,   1.623562064446271,</div>
<div class="line">  -0.691775701702287,   0.857996672828263,   1.254001421602532,  -1.593729576447477,</div>
<div class="line">  -1.440964431901020,   0.571147623658178,  -0.399885577715363,   0.689997375464345</div>
<div class="line"></div>
<div class="line">};</div>
<div class="line"></div>
<div class="line"><span class="comment">/* ----------------------------------------------------------------------</span></div>
<div class="line"><span class="comment">* Declare Global variables</span></div>
<div class="line"><span class="comment">* ------------------------------------------------------------------- */</span></div>
<div class="line">uint32_t <a name="a5"></a><a class="code" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a> = 32;</div>
<div class="line"><a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a>  <a name="a6"></a><a class="code" href="arm__variance__example__f32_8c.html#a26cbbfe2a7905669e8440159465050df">refVarianceOut</a> = 0.903941793931839;</div>
<div class="line"></div>
<div class="line"><span class="comment">/* ----------------------------------------------------------------------</span></div>
<div class="line"><span class="comment">* Variance calculation test</span></div>
<div class="line"><span class="comment">* ------------------------------------------------------------------- */</span></div>
<div class="line"></div>
<div class="line">int32_t <a name="a7"></a><a class="code" href="arm__variance__example__f32_8c.html#a52d2cba30e6946c95578be946ac12a65">main</a>(<span class="keywordtype">void</span>)</div>
<div class="line">{</div>
<div class="line">  <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> <a name="a8"></a><a class="code" href="arm__dotproduct__example__f32_8c.html#a88ccb294236ab22b00310c47164c53c3">status</a>;</div>
<div class="line">  <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> <a name="a9"></a><a class="code" href="arm__class__marks__example__f32_8c.html#acc9290716b3c97381ce52d14b4b01681">mean</a>, oneByBlockSize;</div>
<div class="line">  <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> variance;</div>
<div class="line">  <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> diff;</div>
<div class="line"></div>
<div class="line">  status = <a name="a10"></a><a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a9f8b2a10bd827fb4600e77d455902eb0">ARM_MATH_SUCCESS</a>;</div>
<div class="line"></div>
<div class="line">  <span class="comment">/* Calculation of mean value of input */</span></div>
<div class="line"></div>
<div class="line">  <span class="comment">/* x&#39; = 1/blockSize * (x(0)* 1 + x(1) * 1 + ... + x(n-1) * 1) */</span></div>
<div class="line"></div>
<div class="line">  <span class="comment">/* Fill wire1 buffer with 1.0 value */</span></div>
<div class="line">  <a name="a11"></a><a class="code" href="group__Fill.html#ga2248e8d3901b4afb7827163132baad94">arm_fill_f32</a>(1.0,  <a class="code" href="arm__variance__example__f32_8c.html#acc43b372d92d5027b9f9cac782c8b3c7">wire1</a>, <a class="code" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>);</div>
<div class="line"></div>
<div class="line">  <span class="comment">/* Calculate the dot product of wire1 and wire2 */</span></div>
<div class="line">  <span class="comment">/* (x(0)* 1 + x(1) * 1 + ...+ x(n-1) * 1) */</span></div>
<div class="line">  <a name="a12"></a><a class="code" href="group__dot__prod.html#ga55418d4362f6ba84c327f9b4f089a8c3">arm_dot_prod_f32</a>(<a class="code" href="arm__variance__example__f32_8c.html#a9170ec9e681e2b519fe9c46a30455841">testInput_f32</a>, <a class="code" href="arm__variance__example__f32_8c.html#acc43b372d92d5027b9f9cac782c8b3c7">wire1</a>, <a class="code" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>, &amp;mean);</div>
<div class="line"></div>
<div class="line">  <span class="comment">/* Calculation of 1/blockSize */</span></div>
<div class="line">  oneByBlockSize = 1.0 / (<a class="code" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>);</div>
<div class="line"></div>
<div class="line">  <span class="comment">/* 1/blockSize * (x(0)* 1 + x(1) * 1 + ... + x(n-1) * 1)  */</span></div>
<div class="line">  <a name="a13"></a><a class="code" href="group__BasicMult.html#gaca3f0b8227da431ab29225b88888aa32">arm_mult_f32</a>(&amp;mean, &amp;oneByBlockSize, &amp;mean, 1);</div>
<div class="line"></div>
<div class="line"></div>
<div class="line">  <span class="comment">/* Calculation of variance value of input */</span></div>
<div class="line"></div>
<div class="line">  <span class="comment">/* (1/blockSize) * (x(0) - x&#39;) * (x(0) - x&#39;) + (x(1) - x&#39;) * (x(1) - x&#39;) + ... + (x(n-1) - x&#39;) * (x(n-1) - x&#39;) */</span></div>
<div class="line"></div>
<div class="line">  <span class="comment">/* Fill wire2 with mean value x&#39; */</span></div>
<div class="line">  <a class="code" href="group__Fill.html#ga2248e8d3901b4afb7827163132baad94">arm_fill_f32</a>(mean,  <a class="code" href="arm__variance__example__f32_8c.html#a41a9afab5be5ccd2e6f618b83102f0d1">wire2</a>, <a class="code" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>);</div>
<div class="line"></div>
<div class="line">  <span class="comment">/* wire3 contains (x-x&#39;) */</span></div>
<div class="line">  <a name="a14"></a><a class="code" href="group__BasicSub.html#ga7f975a472de286331134227c08aad826">arm_sub_f32</a>(<a class="code" href="arm__variance__example__f32_8c.html#a9170ec9e681e2b519fe9c46a30455841">testInput_f32</a>, <a class="code" href="arm__variance__example__f32_8c.html#a41a9afab5be5ccd2e6f618b83102f0d1">wire2</a>, <a class="code" href="arm__variance__example__f32_8c.html#af61f43ad332a2322e43ced590b6d9768">wire3</a>, <a class="code" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>);</div>
<div class="line"></div>
<div class="line">  <span class="comment">/* wire2 contains (x-x&#39;) */</span></div>
<div class="line">  <a name="a15"></a><a class="code" href="group__copy.html#gadd1f737e677e0e6ca31767c7001417b3">arm_copy_f32</a>(<a class="code" href="arm__variance__example__f32_8c.html#af61f43ad332a2322e43ced590b6d9768">wire3</a>, <a class="code" href="arm__variance__example__f32_8c.html#a41a9afab5be5ccd2e6f618b83102f0d1">wire2</a>, <a class="code" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>);</div>
<div class="line"></div>
<div class="line">  <span class="comment">/* (x(0) - x&#39;) * (x(0) - x&#39;) + (x(1) - x&#39;) * (x(1) - x&#39;) + ... + (x(n-1) - x&#39;) * (x(n-1) - x&#39;) */</span></div>
<div class="line">  <a class="code" href="group__dot__prod.html#ga55418d4362f6ba84c327f9b4f089a8c3">arm_dot_prod_f32</a>(<a class="code" href="arm__variance__example__f32_8c.html#a41a9afab5be5ccd2e6f618b83102f0d1">wire2</a>, <a class="code" href="arm__variance__example__f32_8c.html#af61f43ad332a2322e43ced590b6d9768">wire3</a>, <a class="code" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>, &amp;variance);</div>
<div class="line"></div>
<div class="line">    <span class="comment">/* Calculation of 1/blockSize */</span></div>
<div class="line">  oneByBlockSize = 1.0 / (<a class="code" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a> - 1);</div>
<div class="line"></div>
<div class="line">  <span class="comment">/* Calculation of variance */</span></div>
<div class="line">  <a class="code" href="group__BasicMult.html#gaca3f0b8227da431ab29225b88888aa32">arm_mult_f32</a>(&amp;variance, &amp;oneByBlockSize, &amp;variance, 1);</div>
<div class="line"></div>
<div class="line">  <span class="comment">/* absolute value of difference between ref and test */</span></div>
<div class="line">  diff = fabsf(<a class="code" href="arm__variance__example__f32_8c.html#a26cbbfe2a7905669e8440159465050df">refVarianceOut</a> - variance);</div>
<div class="line"></div>
<div class="line">  <span class="comment">/* Comparison of variance value with reference */</span></div>
<div class="line">  <span class="keywordflow">if</span> (diff &gt; <a name="a16"></a><a class="code" href="arm__variance__example__f32_8c.html#a3fd2b1bcd7ddcf506237987ad780f495">DELTA</a>)</div>
<div class="line">  {</div>
<div class="line">    status = <a name="a17"></a><a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a09457f2be656b35015fd6d36202fa376">ARM_MATH_TEST_FAILURE</a>;</div>
<div class="line">  }</div>
<div class="line"></div>
<div class="line">  <span class="keywordflow">if</span> ( status != <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a9f8b2a10bd827fb4600e77d455902eb0">ARM_MATH_SUCCESS</a>)</div>
<div class="line">  {</div>
<div class="line">    <span class="keywordflow">while</span> (1);</div>
<div class="line">  }</div>
<div class="line"></div>
<div class="line">  <span class="keywordflow">while</span> (1);                             <span class="comment">/* main function does not return */</span></div>
<div class="line">}</div>
<div class="line"></div>
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