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<div class="title">Complex Dot Product</div> </div>
<div class="ingroups"><a class="el" href="group__group_cmplx_math.html">Complex Math Functions</a></div></div>
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<tr><td colspan="2"><h2><a name="func-members"></a>
Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__cmplx__dot__prod.html#gadcfaf567a25eb641da4043eafb9bb076">arm_cmplx_dot_prod_f32</a> (<a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *pSrcA, <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *pSrcB, uint32_t numSamples, <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *realResult, <a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *imagResult)</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Floating-point complex dot product. <a href="#gadcfaf567a25eb641da4043eafb9bb076"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__cmplx__dot__prod.html#ga2b08b5e8001d2c15204639d00893fc70">arm_cmplx_dot_prod_q15</a> (<a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *pSrcA, <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *pSrcB, uint32_t numSamples, <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *realResult, <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *imagResult)</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Q15 complex dot product. <a href="#ga2b08b5e8001d2c15204639d00893fc70"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__cmplx__dot__prod.html#ga5b731a59db062a9ad84562ef68a6c8af">arm_cmplx_dot_prod_q31</a> (<a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *pSrcA, <a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *pSrcB, uint32_t numSamples, <a class="el" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6">q63_t</a> *realResult, <a class="el" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6">q63_t</a> *imagResult)</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Q31 complex dot product. <a href="#ga5b731a59db062a9ad84562ef68a6c8af"></a><br/></td></tr>
</table>
<hr/><a name="details" id="details"></a><h2>Description</h2>
<p>Computes the dot product of two complex vectors. The vectors are multiplied element-by-element and then summed.</p>
<p>The <code>pSrcA</code> points to the first complex input vector and <code>pSrcB</code> points to the second complex input vector. <code>numSamples</code> specifies the number of complex samples and the data in each array is stored in an interleaved fashion (real, imag, real, imag, ...). Each array has a total of <code>2*numSamples</code> values.</p>
<p>The underlying algorithm is used: </p>
<pre>
realResult=0;
imagResult=0;
for(n=0; n&lt;numSamples; n++) {
realResult += pSrcA[(2*n)+0]*pSrcB[(2*n)+0] - pSrcA[(2*n)+1]*pSrcB[(2*n)+1];
imagResult += pSrcA[(2*n)+0]*pSrcB[(2*n)+1] + pSrcA[(2*n)+1]*pSrcB[(2*n)+0];
}
</pre><p>There are separate functions for floating-point, Q15, and Q31 data types. </p>
<hr/><h2>Function Documentation</h2>
<a class="anchor" id="gadcfaf567a25eb641da4043eafb9bb076"></a><!-- doxytag: member="arm_cmplx_dot_prod_f32.c::arm_cmplx_dot_prod_f32" ref="gadcfaf567a25eb641da4043eafb9bb076" args="(float32_t *pSrcA, float32_t *pSrcB, uint32_t numSamples, float32_t *realResult, float32_t *imagResult)" -->
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<td class="memname">void arm_cmplx_dot_prod_f32 </td>
<td>(</td>
<td class="paramtype"><a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *&#160;</td>
<td class="paramname"><em>pSrcA</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> *&#160;</td>
<td class="paramname"><em>pSrcB</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint32_t&#160;</td>
<td class="paramname"><em>numSamples</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> *&#160;</td>
<td class="paramname"><em>realResult</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> *&#160;</td>
<td class="paramname"><em>imagResult</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">*pSrcA</td><td>points to the first input vector </td></tr>
<tr><td class="paramname">*pSrcB</td><td>points to the second input vector </td></tr>
<tr><td class="paramname">numSamples</td><td>number of complex samples in each vector </td></tr>
<tr><td class="paramname">*realResult</td><td>real part of the result returned here </td></tr>
<tr><td class="paramname">*imagResult</td><td>imaginary part of the result returned here </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>none. </dd></dl>
</div>
</div>
<a class="anchor" id="ga2b08b5e8001d2c15204639d00893fc70"></a><!-- doxytag: member="arm_cmplx_dot_prod_q15.c::arm_cmplx_dot_prod_q15" ref="ga2b08b5e8001d2c15204639d00893fc70" args="(q15_t *pSrcA, q15_t *pSrcB, uint32_t numSamples, q31_t *realResult, q31_t *imagResult)" -->
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<td class="memname">void arm_cmplx_dot_prod_q15 </td>
<td>(</td>
<td class="paramtype"><a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *&#160;</td>
<td class="paramname"><em>pSrcA</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *&#160;</td>
<td class="paramname"><em>pSrcB</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint32_t&#160;</td>
<td class="paramname"><em>numSamples</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> *&#160;</td>
<td class="paramname"><em>realResult</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> *&#160;</td>
<td class="paramname"><em>imagResult</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">*pSrcA</td><td>points to the first input vector </td></tr>
<tr><td class="paramname">*pSrcB</td><td>points to the second input vector </td></tr>
<tr><td class="paramname">numSamples</td><td>number of complex samples in each vector </td></tr>
<tr><td class="paramname">*realResult</td><td>real part of the result returned here </td></tr>
<tr><td class="paramname">*imagResult</td><td>imaginary part of the result returned here </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>none.</dd></dl>
<p><b>Scaling and Overflow Behavior:</b> </p>
<dl class="user"><dt><b></b></dt><dd>The function is implemented using an internal 64-bit accumulator. The intermediate 1.15 by 1.15 multiplications are performed with full precision and yield a 2.30 result. These are accumulated in a 64-bit accumulator with 34.30 precision. As a final step, the accumulators are converted to 8.24 format. The return results <code>realResult</code> and <code>imagResult</code> are in 8.24 format. </dd></dl>
</div>
</div>
<a class="anchor" id="ga5b731a59db062a9ad84562ef68a6c8af"></a><!-- doxytag: member="arm_cmplx_dot_prod_q31.c::arm_cmplx_dot_prod_q31" ref="ga5b731a59db062a9ad84562ef68a6c8af" args="(q31_t *pSrcA, q31_t *pSrcB, uint32_t numSamples, q63_t *realResult, q63_t *imagResult)" -->
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<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void arm_cmplx_dot_prod_q31 </td>
<td>(</td>
<td class="paramtype"><a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *&#160;</td>
<td class="paramname"><em>pSrcA</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> *&#160;</td>
<td class="paramname"><em>pSrcB</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint32_t&#160;</td>
<td class="paramname"><em>numSamples</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> *&#160;</td>
<td class="paramname"><em>realResult</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> *&#160;</td>
<td class="paramname"><em>imagResult</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">*pSrcA</td><td>points to the first input vector </td></tr>
<tr><td class="paramname">*pSrcB</td><td>points to the second input vector </td></tr>
<tr><td class="paramname">numSamples</td><td>number of complex samples in each vector </td></tr>
<tr><td class="paramname">*realResult</td><td>real part of the result returned here </td></tr>
<tr><td class="paramname">*imagResult</td><td>imaginary part of the result returned here </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>none.</dd></dl>
<p><b>Scaling and Overflow Behavior:</b> </p>
<dl class="user"><dt><b></b></dt><dd>The function is implemented using an internal 64-bit accumulator. The intermediate 1.31 by 1.31 multiplications are performed with 64-bit precision and then shifted to 16.48 format. The internal real and imaginary accumulators are in 16.48 format and provide 15 guard bits. Additions are nonsaturating and no overflow will occur as long as <code>numSamples</code> is less than 32768. The return results <code>realResult</code> and <code>imagResult</code> are in 16.48 format. Input down scaling is not required. </dd></dl>
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