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<span id="rfeval"></span><div class="header">
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<span id="Single-remote-function-evaluation"></span><h3 class="section">3.11 Single remote function evaluation</h3>
<span id="index-rfeval-1"></span>
<span id="XREFrfeval"></span><dl>
<dt id="index-rfeval">Function File: <em></em> <strong>rfeval</strong> <em>(<var>func</var>, …, <var>nout</var>, <var>isout</var>, <var>connection</var>)</em></dt>
<dd><p>Evaluate a function at a remote machine.
</p>
<p><var>func</var> is evaluated with arguments <code>…</code> and number of
output arguments set to <var>nout</var> at remote machine given by
<var>connection</var>. If <var>isout</var> is not empty, it must be a logical
array with <var>nout</var> elements, which are true for each of the
<var>nout</var> output arguments which are requested from the function;
the other output arguments will be marked as not requested
with <code>~</code> at remote execution.
</p>
<p>This function can only be successfully called at the client machine.
See <code>pconnect</code> for a description of the <var>connection</var>
variable. <var>connection</var> must contain one single connection.
</p>
<p>If an output argument is given to <code>rfeval</code>, the function waits
for completion of the remote function call, retrieves the results and
returns them. They will be returned as one cell-array with an entry
for each output argument. If some output arguments are marked as not
requested by setting some elements of <var>isout</var> to false, the
returned cell-array will only have entries for the requested output
arguments. For consistency, the returned cell-array can be empty. To
assign the output arguments to single variables, you can for example
use: <code>[a, b, c] = returned_cell_array{:};</code>.
</p>
<p>If no output argument is given to <code>rfeval</code>, the function does
not retrieve the results of the remote function call but returns
immediately. It is left to the user to retrieve the results with
<code>precv</code>. The results will be in the same format as if returned
by <code>rfeval</code>. Note that a cell-array, possibly empty, will always
have to be retrieved, even if the remote function call should have
been performed without output arguments.
</p>
<p>Parallel execution can be achieved by calling <code>rfeval</code> several
times with different specified server machines before starting to
retrieve the results.
</p>
<p>The specified function handle can refer to a function present at
the executing machine or be an anonymous function. See
<code>parallel_doc ("limitations")</code> for possible limitations.
</p>
<p><strong>See also:</strong> <a href="pconnect.html#XREFpconnect">pconnect</a>, <a href="pserver.html#XREFpserver">pserver</a>, <a href="sclose.html#XREFsclose">sclose</a>, <a href="install_005fvars.html#XREFinstall_005fvars">install_vars</a>, <a href="netcellfun.html#XREFnetcellfun">netcellfun</a>.
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