### 3.11 Single remote function evaluation ¶

Function File: rfeval `(func, …, nout, isout, connection)` ¶

  Evaluate a function at a remote machine.

  func is evaluated with arguments `…` and number of output arguments set to nout at remote machine given by connection. If isout is not empty, it must be a logical array with nout elements, which are true for each of the nout output arguments which are requested from the function; the other output arguments will be marked as not requested with `~` at remote execution.

  This function can only be successfully called at the client machine. See `pconnect` for a description of the connection variable. connection must contain one single connection.

  If an output argument is given to `rfeval`, 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 isout 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: `[a, b, c] = returned_cell_array{:};`.

  If no output argument is given to `rfeval`, 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 `precv`. The results will be in the same format as if returned by `rfeval`. 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.

  Parallel execution can be achieved by calling `rfeval` several times with different specified server machines before starting to retrieve the results.

  The specified function handle can refer to a function present at the executing machine or be an anonymous function. See `parallel_doc ("limitations")` for possible limitations.