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5 Limitations of high- and medium-level functions

For the function handles passed as arguments to Function parcellfun, Function pararrayfun, Function netcellfun, Function netarrayfun, and Single remote function evaluation, the following limitations may apply:

• In Octave versions before 5.1, anonymous functions may only be passed if they don’t use varargin and don’t contain nested anonymous functions.
• If a handle to a named function, written in a function file, is passed, this function must exist on the server machine. This is usually no problem for Function parcellfun and Function pararrayfun.
• Named functions defined in the command line interface or by scripts are not exported to the working sessions used by Function parcellfun or Function pararrayfun, and not automatically to the server for remote parallel execution.
• For handles to subfunctions or to private functions limitations depending on the used Octave version may apply.

Anonymous functions should be usable as usual, since the function specification sent to the server will include the anonymous functions context.

There is no way to set global variables for the function called by parcellun or pararrayfun. For cluster execution, setting global variables is possible, e.g. with Distribute Octave variables; however, netcellfun and netarrayfun won’t ’see’ global variables if they use parcellfun internally (which is the default at remote machines with more than one available processor core).