[Octave-bug-tracker] [bug #61650] [parallel package]function pararrayfun gives wrong result when dealing with graphics handles

[Pantxo Diribarne]

Follow-up Comment #3, bug #61650 (project octave):

The parallel package basically instantiates multiple Octave sessions to do
computations in parallel, and return the result. With this approach, the
handles (double value) to graphics object that were built in another session
than the master are not usable. This is expected.
 
Here is a simplified example of what you are trying to do:


## Function to be executed in parallel
fcn = @(n) line ("xdata", 1:10, "ydata", 1:10, "displayname", sprintf ("line
%d", n))

N = 1:10;
nproc = 4;

## With arrayfun it works
hlines = arrayfun (fcn, N);
ishghandle (hlines)
legend


## With pararrayfun it doesn't work
hlines = pararrayfun (nproc, fcn, N);
ishghandle (hlines)


None of the handles in hlines is valid because the objects don't belong to the
graphics system of the master Octave session.

I think this is not expected to work and this report would qualify as "won't
fix" but I am not an expert of the parallel package though.

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