Check whether Composite is defined on workers
h = exist(C,labidx)
h = exist(C)
h = exist(C,labidx) returns true if the
entry in Composite C has a defined value on the worker with
labindex labidx, false otherwise. In the
general case where labidx is an array, the output
h is an array of the same size as labidx,
and h(i) indicates whether the Composite entry
labidx(i) has a defined value.
h = exist(C) is equivalent to h = exist(C,
1:length(C)).
If exist(C,labidx) returns true,
C(labidx) does not throw an error, provided that the values
of C on those workers are serializable. The function throws an
error if any labidx is invalid.
Define a variable on a random number of workers. Check on which workers the Composite entries are defined, and get all those values:
spmd if rand() > 0.5 c = labindex; end end ind = exist(c); cvals = c(ind);