smpd assigning to workers with labindex

I have used system(externalporgrema) in my program and can therfore not parfor. How can I assigne fprintf to each work so that I get this function to work.

n=100000

spmd
    while i < n+1
        i = labindex + k;
        
        fprintf('iteration number %d and k %d, labindex %d \n',labindex+k,k,labindex);
        
        if labindex == prs
            k = k +prs;
        end
    end
end

[Edric Ellis]

There is no fundamental restriction on using system from within a parfor loop. It's not clear what you're trying to parallelise here - what does your serial code look like?

[Knut Jørgen]

The code look like this and it load data from freesurfer.

for i=1:n

system(run mplus on each collum)

end