There are two main subtleties in parallel computations:

Nested parallel evaluations (see No Nested parfor Loops). Only the outermost

`parfor`

loop runs in parallel, the others run serially.Reproducible results when using random numbers (see Reproducibility in Parallel Statistical Computations). How can you get exactly the same results when repeatedly running a parallel computation that uses random numbers?

*worker*— An independent MATLAB^{®}session that runs code distributed by the*client*.*client*— The MATLAB session with which you interact, and that distributes jobs to workers.`parfor`

— A Parallel Computing Toolbox™ function that distributes independent code segments to workers (see Working with parfor).*random stream*— A pseudorandom number generator, and the sequence of values it generates. MATLAB implements random streams with the`RandStream`

class.*reproducible computation*— A computation that can be exactly replicated, even in the presence of random numbers (see Reproducibility in Parallel Statistical Computations).

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