what does "parpool close force local" mean?

I am using a code based on old version matlab, and I got a error when it comes to:

if numProc <= 1  
    parpool close force local
else
%     poolSize = parpool('size');  % check to see if a pool is already open
    p = gcp('nocreate'); % If no pool, do not create new one.
    if isempty(p)
        poolSize = 0;
    else
        poolSize = p.NumWorkers
    end
    
    if poolSize == 0 || poolSize < numProc || poolSize ~= numProc
        parpool close force local

        eval(['parpool open ' num2str(numProc)])
    end
end

and got the following error:

Error using parpool (line 145)
Properties and values must be specified in pairs.

it seems that the command has been deprecated, what does it mean? and what is its alternatives?

thank you in advance!

Answer 1

[Walter Roberson]

Something like,

if numProc <= 1
    p = gcp('nocreate');
    if ~isempty(p)
        delete(p);
    end
    poolSize = 0;
else
    p = gcp('nocreate');
    if isempty(p)
        poolSize = 0;
    else
        poolSize = p.NumWorkers;
        if poolSize ~= numProc
            delete(p);
            poolSize = 0;
        end
    end
    if poolSize == 0
        try
            p = parpool(numProc);
            poolSize = p.NumWorkers;
        catch
            poolSize = 0;
        end
    end
end

[zhu wenguo]

Thank you very much! it works!