How can we create a distributed array for specific number of workers (cores) in MATLAB?

I have a question: How can we create a distributed array for specific number of workers in MATLAB? In other words, if we have 4 workers(cores) in our computer and we would like to designate just 3 workers to process a distributed array, how can we do that. I used the existing commands in this way:

a=[1 2 3 4 5 6]; b=codistributed(a);

Unfortunately, this instruction use all four workers!

Please, any idea how to solve this problem?

Kind regards Ammar

Answer 1

[Edric Ellis]

You could either create the pool explicitly using only three workers

parpool(3)

Or, you could use spmd with the optional argument

spmd(3)
    b = codistributed(a);
end

[Ammar]

Dear Edric,

I would like to thank you for this answer.

Please, could you help me find a solution for my second question ? https://uk.mathworks.com/matlabcentral/answers/351806-how-can-implement-parallel-pipeline-using-3-workers-in-one-computer

Regards Ammar