Clear function inside a parfor loop: Transparency violation error

Dear community,

I tried to find some answers about the topic in this title, but I found only the problem concerns to set the variable as empty.

I don't clear a variable but a function, as shown in the example below. This produce a transparency violation error. Could someone help me? I need to clear the function in every loops.

Kind regard

Califfo

parfor i=1:N1    
    for j = 1:N2
        
        clear myfunction
        
        [outputs] = myfunction(inputs);
       
    end
    
end

Answer 1

[Jan]

What is the purpose of clearing the function? Do you want to get rid of persistently stored variables? This could be done more efficiently, e.g. by:

function outputs = myfunction(inputs)
persistent a,b
if nargin == 0
    a = [];
    b = [];
    return;
end
end

Now call myfunction() instead of clearing it. This avoid a time-consuming reloading of the function from the disk and the reparsing.

[Califfo]

Thank you Jan for the suggestion, now it works

Califfo

Answer 2

[Gouri Chennuru]

Hi,

You can refer to this link

https://www.mathworks.com/help/parallel-computing/transparency.html

Hope this helps!