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<a href="#func-members">Functions</a> </div>
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<div class="title">Vector Dot Product<div class="ingroups"><a class="el" href="group__groupMath.html">Basic Math Functions</a></div></div> </div>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:gadf26f6bc62d6416528663ad3e46fbf67"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__BasicDotProd.html#gadf26f6bc62d6416528663ad3e46fbf67">arm_dot_prod_f32</a> (const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *pSrcA, const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *pSrcB, uint32_t <a class="el" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>, <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *result)</td></tr>
<tr class="memdesc:gadf26f6bc62d6416528663ad3e46fbf67"><td class="mdescLeft"> </td><td class="mdescRight">Dot product of floating-point vectors. <a href="#gadf26f6bc62d6416528663ad3e46fbf67">More...</a><br/></td></tr>
<tr class="separator:gadf26f6bc62d6416528663ad3e46fbf67"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gac2314012fbbf73bfd95ce8c57bc9ba69"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__BasicDotProd.html#gac2314012fbbf73bfd95ce8c57bc9ba69">arm_dot_prod_q15</a> (const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *pSrcA, const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *pSrcB, uint32_t <a class="el" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>, <a class="el" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6">q63_t</a> *result)</td></tr>
<tr class="memdesc:gac2314012fbbf73bfd95ce8c57bc9ba69"><td class="mdescLeft"> </td><td class="mdescRight">Dot product of Q15 vectors. <a href="#gac2314012fbbf73bfd95ce8c57bc9ba69">More...</a><br/></td></tr>
<tr class="separator:gac2314012fbbf73bfd95ce8c57bc9ba69"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gafe3f9ace6c4576847eabf44ed7ca7b96"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__BasicDotProd.html#gafe3f9ace6c4576847eabf44ed7ca7b96">arm_dot_prod_q31</a> (const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *pSrcA, const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *pSrcB, uint32_t <a class="el" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>, <a class="el" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6">q63_t</a> *result)</td></tr>
<tr class="memdesc:gafe3f9ace6c4576847eabf44ed7ca7b96"><td class="mdescLeft"> </td><td class="mdescRight">Dot product of Q31 vectors. <a href="#gafe3f9ace6c4576847eabf44ed7ca7b96">More...</a><br/></td></tr>
<tr class="separator:gafe3f9ace6c4576847eabf44ed7ca7b96"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gaadd347d5f5adf902c63f0b90ffc19538"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__BasicDotProd.html#gaadd347d5f5adf902c63f0b90ffc19538">arm_dot_prod_q7</a> (const <a class="el" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263">q7_t</a> *pSrcA, const <a class="el" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263">q7_t</a> *pSrcB, uint32_t <a class="el" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>, <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *result)</td></tr>
<tr class="memdesc:gaadd347d5f5adf902c63f0b90ffc19538"><td class="mdescLeft"> </td><td class="mdescRight">Dot product of Q7 vectors. <a href="#gaadd347d5f5adf902c63f0b90ffc19538">More...</a><br/></td></tr>
<tr class="separator:gaadd347d5f5adf902c63f0b90ffc19538"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Description</h2>
<p>Computes the dot product of two vectors. The vectors are multiplied element-by-element and then summed.</p>
<pre>
sum = pSrcA[0]*pSrcB[0] + pSrcA[1]*pSrcB[1] + ... + pSrcA[blockSize-1]*pSrcB[blockSize-1]
</pre><p>There are separate functions for floating-point, Q7, Q15, and Q31 data types. </p>
<h2 class="groupheader">Function Documentation</h2>
<a class="anchor" id="gadf26f6bc62d6416528663ad3e46fbf67"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void arm_dot_prod_f32 </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> * </td>
<td class="paramname"><em>pSrcA</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> * </td>
<td class="paramname"><em>pSrcB</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint32_t </td>
<td class="paramname"><em>blockSize</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> * </td>
<td class="paramname"><em>result</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">pSrcA</td><td>points to the first input vector. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">pSrcB</td><td>points to the second input vector. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">blockSize</td><td>number of samples in each vector. </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">result</td><td>output result returned here. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>none </dd></dl>
</div>
</div>
<a class="anchor" id="gac2314012fbbf73bfd95ce8c57bc9ba69"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void arm_dot_prod_q15 </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> * </td>
<td class="paramname"><em>pSrcA</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> * </td>
<td class="paramname"><em>pSrcB</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint32_t </td>
<td class="paramname"><em>blockSize</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6">q63_t</a> * </td>
<td class="paramname"><em>result</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">pSrcA</td><td>points to the first input vector </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">pSrcB</td><td>points to the second input vector </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">blockSize</td><td>number of samples in each vector </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">result</td><td>output result returned here </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>none</dd></dl>
<dl class="section user"><dt>Scaling and Overflow Behavior</dt><dd>The intermediate multiplications are in 1.15 x 1.15 = 2.30 format and these results are added to a 64-bit accumulator in 34.30 format. Nonsaturating additions are used and given that there are 33 guard bits in the accumulator there is no risk of overflow. The return result is in 34.30 format. </dd></dl>
</div>
</div>
<a class="anchor" id="gafe3f9ace6c4576847eabf44ed7ca7b96"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void arm_dot_prod_q31 </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
<td class="paramname"><em>pSrcA</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
<td class="paramname"><em>pSrcB</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint32_t </td>
<td class="paramname"><em>blockSize</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6">q63_t</a> * </td>
<td class="paramname"><em>result</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">pSrcA</td><td>points to the first input vector. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">pSrcB</td><td>points to the second input vector. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">blockSize</td><td>number of samples in each vector. </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">result</td><td>output result returned here. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>none</dd></dl>
<dl class="section user"><dt>Scaling and Overflow Behavior</dt><dd>The intermediate multiplications are in 1.31 x 1.31 = 2.62 format and these are truncated to 2.48 format by discarding the lower 14 bits. The 2.48 result is then added without saturation to a 64-bit accumulator in 16.48 format. There are 15 guard bits in the accumulator and there is no risk of overflow as long as the length of the vectors is less than 2^16 elements. The return result is in 16.48 format. </dd></dl>
</div>
</div>
<a class="anchor" id="gaadd347d5f5adf902c63f0b90ffc19538"></a>
<div class="memitem">
<div class="memproto">
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<td class="memname">void arm_dot_prod_q7 </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263">q7_t</a> * </td>
<td class="paramname"><em>pSrcA</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263">q7_t</a> * </td>
<td class="paramname"><em>pSrcB</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint32_t </td>
<td class="paramname"><em>blockSize</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
<td class="paramname"><em>result</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">pSrcA</td><td>points to the first input vector </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">pSrcB</td><td>points to the second input vector </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">blockSize</td><td>number of samples in each vector </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">result</td><td>output result returned here </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>none</dd></dl>
<dl class="section user"><dt>Scaling and Overflow Behavior</dt><dd>The intermediate multiplications are in 1.7 x 1.7 = 2.14 format and these results are added to an accumulator in 18.14 format. Nonsaturating additions are used and there is no danger of wrap around as long as the vectors are less than 2^18 elements long. The return result is in 18.14 format. </dd></dl>
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