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<div class="header">
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<a href="#func-members">Functions</a>  </div>
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<p>SQL functions for random sampling.  
<a href="#details">More...</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:af933c6e9d6623c62a671dc74e5bd9d51"><td class="memItemLeft" align="right" valign="top">bytea8&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="sample_8sql__in.html#af933c6e9d6623c62a671dc74e5bd9d51">weighted_sample_transition_int64</a> (bytea8 state, bigint value, float8 weight)</td></tr>
<tr class="separator:af933c6e9d6623c62a671dc74e5bd9d51"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aa066d40345787e00819963f095f40998"><td class="memItemLeft" align="right" valign="top">bytea8&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="sample_8sql__in.html#aa066d40345787e00819963f095f40998">weighted_sample_merge_int64</a> (bytea8 state_left, bytea8 state_right)</td></tr>
<tr class="separator:aa066d40345787e00819963f095f40998"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a5c2226995c3ef02cb2320b9829bad5eb"><td class="memItemLeft" align="right" valign="top">bigint&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="sample_8sql__in.html#a5c2226995c3ef02cb2320b9829bad5eb">weighted_sample_final_int64</a> (bytea8 state)</td></tr>
<tr class="separator:a5c2226995c3ef02cb2320b9829bad5eb"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ab933c8334edc748aa9ef46b9bb50e60e"><td class="memItemLeft" align="right" valign="top">aggregate bytea8&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="sample_8sql__in.html#ab933c8334edc748aa9ef46b9bb50e60e">weighted_sample</a> (bigint value, float8 weight)</td></tr>
<tr class="memdesc:ab933c8334edc748aa9ef46b9bb50e60e"><td class="mdescLeft">&#160;</td><td class="mdescRight">Sample a single row according to weights.  <a href="#ab933c8334edc748aa9ef46b9bb50e60e">More...</a><br /></td></tr>
<tr class="separator:ab933c8334edc748aa9ef46b9bb50e60e"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ae7ad8a80a8c2508cc54cf496934017c2"><td class="memItemLeft" align="right" valign="top">bytea8&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="sample_8sql__in.html#ae7ad8a80a8c2508cc54cf496934017c2">weighted_sample_transition_vector</a> (bytea8 state, float8[] value, float8 weight)</td></tr>
<tr class="separator:ae7ad8a80a8c2508cc54cf496934017c2"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ac5d00ff9e30dcae8a1b6b8450df3e95e"><td class="memItemLeft" align="right" valign="top">bytea8&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="sample_8sql__in.html#ac5d00ff9e30dcae8a1b6b8450df3e95e">weighted_sample_merge_vector</a> (bytea8 state_left, bytea8 state_right)</td></tr>
<tr class="separator:ac5d00ff9e30dcae8a1b6b8450df3e95e"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a8b2b3bb57b01f47bafe44bea73f39f78"><td class="memItemLeft" align="right" valign="top">float8 []&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="sample_8sql__in.html#a8b2b3bb57b01f47bafe44bea73f39f78">weighted_sample_final_vector</a> (bytea8 state)</td></tr>
<tr class="separator:a8b2b3bb57b01f47bafe44bea73f39f78"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aa650ad075377cec7c6e1ece37c2b55b0"><td class="memItemLeft" align="right" valign="top">aggregate bytea8&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="sample_8sql__in.html#aa650ad075377cec7c6e1ece37c2b55b0">weighted_sample</a> (float8[] value, float8 weight)</td></tr>
<tr class="separator:aa650ad075377cec7c6e1ece37c2b55b0"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a2051a3f21bc06e3c6e3efcd7492b71c4"><td class="memItemLeft" align="right" valign="top">integer&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="sample_8sql__in.html#a2051a3f21bc06e3c6e3efcd7492b71c4">poisson_random</a> (float8 <a class="el" href="svec__util_8sql__in.html#a546b947319c9f48237120a31929bdfd9">mean</a>)</td></tr>
<tr class="separator:a2051a3f21bc06e3c6e3efcd7492b71c4"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:afc523f72e64820329acb8874c2a759d3"><td class="memItemLeft" align="right" valign="top">float8&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="sample_8sql__in.html#afc523f72e64820329acb8874c2a759d3">gamma_random</a> (float8 alpha)</td></tr>
<tr class="separator:afc523f72e64820329acb8874c2a759d3"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:af0bfa324d198f8059566757f38fe5c93"><td class="memItemLeft" align="right" valign="top">integer&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="sample_8sql__in.html#af0bfa324d198f8059566757f38fe5c93">index_weighted_sample</a> (float8[])</td></tr>
<tr class="separator:af0bfa324d198f8059566757f38fe5c93"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><dl class="section see"><dt>See also</dt><dd>For an overview of random-sampling functions, see the module description <a class="el" href="group__grp__sample.html">Random Sampling</a>. </dd></dl>
</div><h2 class="groupheader">Function Documentation</h2>
<a id="afc523f72e64820329acb8874c2a759d3"></a>
<h2 class="memtitle"><span class="permalink"><a href="#afc523f72e64820329acb8874c2a759d3">&#9670;&nbsp;</a></span>gamma_random()</h2>

<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">float8 gamma_random </td>
          <td>(</td>
          <td class="paramtype">float8&#160;</td>
          <td class="paramname"><em>alpha</em></td><td>)</td>
          <td></td>
        </tr>
      </table>
</div><div class="memdoc">

</div>
</div>
<a id="af0bfa324d198f8059566757f38fe5c93"></a>
<h2 class="memtitle"><span class="permalink"><a href="#af0bfa324d198f8059566757f38fe5c93">&#9670;&nbsp;</a></span>index_weighted_sample()</h2>

<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">integer index_weighted_sample </td>
          <td>(</td>
          <td class="paramtype">float8&#160;</td>
          <td class="paramname">[]</td><td>)</td>
          <td></td>
        </tr>
      </table>
</div><div class="memdoc">

</div>
</div>
<a id="a2051a3f21bc06e3c6e3efcd7492b71c4"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a2051a3f21bc06e3c6e3efcd7492b71c4">&#9670;&nbsp;</a></span>poisson_random()</h2>

<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">integer poisson_random </td>
          <td>(</td>
          <td class="paramtype">float8&#160;</td>
          <td class="paramname"><em>mean</em></td><td>)</td>
          <td></td>
        </tr>
      </table>
</div><div class="memdoc">

</div>
</div>
<a id="ab933c8334edc748aa9ef46b9bb50e60e"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ab933c8334edc748aa9ef46b9bb50e60e">&#9670;&nbsp;</a></span>weighted_sample() <span class="overload">[1/2]</span></h2>

<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">aggregate bytea8 weighted_sample </td>
          <td>(</td>
          <td class="paramtype">bigint&#160;</td>
          <td class="paramname"><em>value</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">float8&#160;</td>
          <td class="paramname"><em>weight</em>&#160;</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="paramname">value</td><td>Value of row. Uniqueness is not enforced. If a value occurs multiple times, the probability of sampling this value is proportional to the sum of its weights. </td></tr>
    <tr><td class="paramname">weight</td><td>Weight for row. A negative value here is treated has zero weight. </td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd><code>identifier</code> of the selected row. The probability of sampling any particular row <code>(value, weight)</code> is <code>weight/SUM(weight)</code>. </dd></dl>

</div>
</div>
<a id="aa650ad075377cec7c6e1ece37c2b55b0"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aa650ad075377cec7c6e1ece37c2b55b0">&#9670;&nbsp;</a></span>weighted_sample() <span class="overload">[2/2]</span></h2>

<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">aggregate bytea8 weighted_sample </td>
          <td>(</td>
          <td class="paramtype">float8 []&#160;</td>
          <td class="paramname"><em>value</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">float8&#160;</td>
          <td class="paramname"><em>weight</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">

</div>
</div>
<a id="a5c2226995c3ef02cb2320b9829bad5eb"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a5c2226995c3ef02cb2320b9829bad5eb">&#9670;&nbsp;</a></span>weighted_sample_final_int64()</h2>

<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">bigint weighted_sample_final_int64 </td>
          <td>(</td>
          <td class="paramtype">bytea8&#160;</td>
          <td class="paramname"><em>state</em></td><td>)</td>
          <td></td>
        </tr>
      </table>
</div><div class="memdoc">

</div>
</div>
<a id="a8b2b3bb57b01f47bafe44bea73f39f78"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a8b2b3bb57b01f47bafe44bea73f39f78">&#9670;&nbsp;</a></span>weighted_sample_final_vector()</h2>

<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">float8 [] weighted_sample_final_vector </td>
          <td>(</td>
          <td class="paramtype">bytea8&#160;</td>
          <td class="paramname"><em>state</em></td><td>)</td>
          <td></td>
        </tr>
      </table>
</div><div class="memdoc">

</div>
</div>
<a id="aa066d40345787e00819963f095f40998"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aa066d40345787e00819963f095f40998">&#9670;&nbsp;</a></span>weighted_sample_merge_int64()</h2>

<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">bytea8 weighted_sample_merge_int64 </td>
          <td>(</td>
          <td class="paramtype">bytea8&#160;</td>
          <td class="paramname"><em>state_left</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">bytea8&#160;</td>
          <td class="paramname"><em>state_right</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">

</div>
</div>
<a id="ac5d00ff9e30dcae8a1b6b8450df3e95e"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ac5d00ff9e30dcae8a1b6b8450df3e95e">&#9670;&nbsp;</a></span>weighted_sample_merge_vector()</h2>

<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">bytea8 weighted_sample_merge_vector </td>
          <td>(</td>
          <td class="paramtype">bytea8&#160;</td>
          <td class="paramname"><em>state_left</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">bytea8&#160;</td>
          <td class="paramname"><em>state_right</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">

</div>
</div>
<a id="af933c6e9d6623c62a671dc74e5bd9d51"></a>
<h2 class="memtitle"><span class="permalink"><a href="#af933c6e9d6623c62a671dc74e5bd9d51">&#9670;&nbsp;</a></span>weighted_sample_transition_int64()</h2>

<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">bytea8 weighted_sample_transition_int64 </td>
          <td>(</td>
          <td class="paramtype">bytea8&#160;</td>
          <td class="paramname"><em>state</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">bigint&#160;</td>
          <td class="paramname"><em>value</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">float8&#160;</td>
          <td class="paramname"><em>weight</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">

</div>
</div>
<a id="ae7ad8a80a8c2508cc54cf496934017c2"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ae7ad8a80a8c2508cc54cf496934017c2">&#9670;&nbsp;</a></span>weighted_sample_transition_vector()</h2>

<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">bytea8 weighted_sample_transition_vector </td>
          <td>(</td>
          <td class="paramtype">bytea8&#160;</td>
          <td class="paramname"><em>state</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">float8 []&#160;</td>
          <td class="paramname"><em>value</em>, </td>
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        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">float8&#160;</td>
          <td class="paramname"><em>weight</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
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