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<span id="precv"></span><div class="header">
<p>
Next: <a href="reval.html" accesskey="n" rel="next">reval</a>, Previous: <a href="psend.html" accesskey="p" rel="prev">psend</a>, Up: <a href="Cluster-execution.html" accesskey="u" rel="up">Cluster execution</a> [<a href="Function-index.html" title="Index" rel="index">Index</a>]</p>
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<span id="Receiving-Octave-variables"></span><h3 class="section">3.13 Receiving Octave variables</h3>
<span id="index-precv-1"></span>
<span id="XREFprecv"></span><dl>
<dt id="index-precv">Loadable Function: <em></em> <strong>precv</strong> <em>(<var>single_connection</var>)</em></dt>
<dd><p>Receive a data value from the parallel cluster machine specified by <var>single_connection</var>.
</p>
<p>This function can be called both at the client machine and (with
<code>reval</code>) at a server machine. <var>single_connection</var> must be a
single connection obtained by indexing the <var>connections</var>
variable. Please see <code>pconnect</code> for a description of the
<var>connections</var> variable, and <code>pserver</code> for a description of
this variable (named <code>sockets</code>) at the server side. If
<var>single_connection</var> corresponds to the machine at which
<code>precv</code> was called, an error is thrown.
</p>
<p>The value received with <code>precv</code> must be sent with <code>psend</code>
from another machine of the cluster. Note that data can be transferred
this way between each pair of machines, even sent by a server and
received by a different server.
</p>
<p>If <code>precv</code> is called at the client machine, a corresponding
<code>psend</code> should have been called before at the source machine,
otherwise the client will hang.
</p>
<p><strong>See also:</strong> <a href="pconnect.html#XREFpconnect">pconnect</a>, <a href="pserver.html#XREFpserver">pserver</a>, <a href="reval.html#XREFreval">reval</a>, <a href="psend.html#XREFpsend">psend</a>, <a href="sclose.html#XREFsclose">sclose</a>, <a href="Authentication.html#XREFparallel_005fgenerate_005fsrp_005fdata">parallel_generate_srp_data</a>, <a href="select_005fsockets.html#XREFselect_005fsockets">select_sockets</a>.
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