332 lines
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332 lines
18 KiB
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<title>CMSIS-DSP: Mean</title>
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<div id="projectname">CMSIS-DSP
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 <span id="projectnumber">Version 1.5.1</span>
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<div id="projectbrief">CMSIS DSP Software Library</div>
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<a href="#func-members">Functions</a> </div>
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<div class="headertitle">
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<div class="title">Mean<div class="ingroups"><a class="el" href="group__groupStats.html">Statistics Functions</a></div></div> </div>
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</div><!--header-->
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<div class="contents">
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
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Functions</h2></td></tr>
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<tr class="memitem:ga74ce08c49ab61e57bd50c3a0ca1fdb2b"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mean.html#ga74ce08c49ab61e57bd50c3a0ca1fdb2b">arm_mean_f32</a> (<a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *pSrc, 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> *pResult)</td></tr>
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<tr class="memdesc:ga74ce08c49ab61e57bd50c3a0ca1fdb2b"><td class="mdescLeft"> </td><td class="mdescRight">Mean value of a floating-point vector. <a href="#ga74ce08c49ab61e57bd50c3a0ca1fdb2b">More...</a><br/></td></tr>
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<tr class="separator:ga74ce08c49ab61e57bd50c3a0ca1fdb2b"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gac882495d5f098819fd3939c1ef7795b3"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mean.html#gac882495d5f098819fd3939c1ef7795b3">arm_mean_q15</a> (<a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *pSrc, uint32_t <a class="el" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>, <a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *pResult)</td></tr>
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<tr class="memdesc:gac882495d5f098819fd3939c1ef7795b3"><td class="mdescLeft"> </td><td class="mdescRight">Mean value of a Q15 vector. <a href="#gac882495d5f098819fd3939c1ef7795b3">More...</a><br/></td></tr>
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<tr class="separator:gac882495d5f098819fd3939c1ef7795b3"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gacf2526d8c2d75e486e8f0b0e31877ad0"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mean.html#gacf2526d8c2d75e486e8f0b0e31877ad0">arm_mean_q31</a> (<a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *pSrc, 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> *pResult)</td></tr>
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<tr class="memdesc:gacf2526d8c2d75e486e8f0b0e31877ad0"><td class="mdescLeft"> </td><td class="mdescRight">Mean value of a Q31 vector. <a href="#gacf2526d8c2d75e486e8f0b0e31877ad0">More...</a><br/></td></tr>
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<tr class="separator:gacf2526d8c2d75e486e8f0b0e31877ad0"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gaebc707ee539020357c25da4c75b52eb7"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mean.html#gaebc707ee539020357c25da4c75b52eb7">arm_mean_q7</a> (<a class="el" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263">q7_t</a> *pSrc, uint32_t <a class="el" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>, <a class="el" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263">q7_t</a> *pResult)</td></tr>
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<tr class="memdesc:gaebc707ee539020357c25da4c75b52eb7"><td class="mdescLeft"> </td><td class="mdescRight">Mean value of a Q7 vector. <a href="#gaebc707ee539020357c25da4c75b52eb7">More...</a><br/></td></tr>
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<tr class="separator:gaebc707ee539020357c25da4c75b52eb7"><td class="memSeparator" colspan="2"> </td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Description</h2>
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<p>Calculates the mean of the input vector. Mean is defined as the average of the elements in the vector. The underlying algorithm is used:</p>
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<pre>
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Result = (pSrc[0] + pSrc[1] + pSrc[2] + ... + pSrc[blockSize-1]) / blockSize;
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</pre><p>There are separate functions for floating-point, Q31, Q15, and Q7 data types. </p>
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<h2 class="groupheader">Function Documentation</h2>
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<a class="anchor" id="ga74ce08c49ab61e57bd50c3a0ca1fdb2b"></a>
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<table class="memname">
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<tr>
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<td class="memname">void arm_mean_f32 </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> * </td>
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<td class="paramname"><em>pSrc</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>blockSize</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype"><a class="el" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> * </td>
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<td class="paramname"><em>pResult</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir">[in]</td><td class="paramname">*pSrc</td><td>points to the input vector </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">blockSize</td><td>length of the input vector </td></tr>
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<tr><td class="paramdir">[out]</td><td class="paramname">*pResult</td><td>mean value returned here </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>none. </dd></dl>
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<p>References <a class="el" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>.</p>
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<p>Referenced by <a class="el" href="arm__class__marks__example__f32_8c.html#a196718f834091385d38586a0ce4009dc">main()</a>.</p>
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</div>
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</div>
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<a class="anchor" id="gac882495d5f098819fd3939c1ef7795b3"></a>
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<div class="memitem">
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<table class="memname">
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<td class="memname">void arm_mean_q15 </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> * </td>
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<td class="paramname"><em>pSrc</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>blockSize</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype"><a class="el" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> * </td>
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<td class="paramname"><em>pResult</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir">[in]</td><td class="paramname">*pSrc</td><td>points to the input vector </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">blockSize</td><td>length of the input vector </td></tr>
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<tr><td class="paramdir">[out]</td><td class="paramname">*pResult</td><td>mean value returned here </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>none.</dd></dl>
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<p><b>Scaling and Overflow Behavior:</b> </p>
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<dl class="section user"><dt></dt><dd>The function is implemented using a 32-bit internal accumulator. The input is represented in 1.15 format and is accumulated in a 32-bit accumulator in 17.15 format. There is no risk of internal overflow with this approach, and the full precision of intermediate result is preserved. Finally, the accumulator is saturated and truncated to yield a result of 1.15 format. </dd></dl>
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<p>References <a class="el" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248">__SIMD32</a>, and <a class="el" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>.</p>
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</div>
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</div>
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<a class="anchor" id="gacf2526d8c2d75e486e8f0b0e31877ad0"></a>
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<div class="memitem">
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<table class="memname">
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<tr>
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<td class="memname">void arm_mean_q31 </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>pSrc</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>blockSize</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype"><a class="el" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>pResult</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir">[in]</td><td class="paramname">*pSrc</td><td>points to the input vector </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">blockSize</td><td>length of the input vector </td></tr>
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<tr><td class="paramdir">[out]</td><td class="paramname">*pResult</td><td>mean value returned here </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>none.</dd></dl>
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<p><b>Scaling and Overflow Behavior:</b> </p>
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<dl class="section user"><dt></dt><dd>The function is implemented using a 64-bit internal accumulator. The input is represented in 1.31 format and is accumulated in a 64-bit accumulator in 33.31 format. There is no risk of internal overflow with this approach, and the full precision of intermediate result is preserved. Finally, the accumulator is truncated to yield a result of 1.31 format. </dd></dl>
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<p>References <a class="el" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>.</p>
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</div>
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</div>
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<a class="anchor" id="gaebc707ee539020357c25da4c75b52eb7"></a>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<tr>
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<td class="memname">void arm_mean_q7 </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263">q7_t</a> * </td>
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<td class="paramname"><em>pSrc</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>blockSize</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype"><a class="el" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263">q7_t</a> * </td>
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<td class="paramname"><em>pResult</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir">[in]</td><td class="paramname">*pSrc</td><td>points to the input vector </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">blockSize</td><td>length of the input vector </td></tr>
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<tr><td class="paramdir">[out]</td><td class="paramname">*pResult</td><td>mean value returned here </td></tr>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>none.</dd></dl>
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<p><b>Scaling and Overflow Behavior:</b> </p>
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<dl class="section user"><dt></dt><dd>The function is implemented using a 32-bit internal accumulator. The input is represented in 1.7 format and is accumulated in a 32-bit accumulator in 25.7 format. There is no risk of internal overflow with this approach, and the full precision of intermediate result is preserved. Finally, the accumulator is truncated to yield a result of 1.7 format. </dd></dl>
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<p>References <a class="el" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248">__SIMD32</a>, and <a class="el" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>.</p>
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