Function counts using parallel Fmincon
1 visualizzazione (ultimi 30 giorni)
Mostra commenti meno recenti
Hello all,
I would like to use parallel fmincon. The function receivea an input vector X, generates a file name say Filei.txt (i.e. File1.txt, File2.txt, File3.txt,... at each iteration), runs a external program for the file, and will produce an out put y.
function y= f(X)
% (1) 'count' is the function call number
% (2) genera a file using X and count
name=strcat( 'File.' ,num2str(count),'.txt');
% run an external program say C.exe which takes name as its input and return y
% return y
I would like to use the parallel Fmincon to minimize this function. However, I know that I can not use persisten with parallel fmincon to generate the variable 'count'. Could you please suggest what should I do in this case?
0 Commenti
Risposte (1)
Walter Roberson
il 31 Ago 2017
Modificato: Walter Roberson
il 31 Ago 2017
Each worker has its own copy of the persistent variable. So use the local persistent variable together with the worker number to construct the file name. For example
t = getCurrentTask(); worker_number = t.ID;
name = sprintf('File.%d_%06d.txt', worker_number, count);
Question: is it important that the file names be sequential? Or do they just have to be different ? If they just have to be different, then use tempname()
2 Commenti
Walter Roberson
il 31 Ago 2017
You can use persistent in something called by parfor.
N = 123;
T = zeros(1,N);
parfor K = 1 : N; T(K) = tryper(); end
T
length(unique(T))
function c = tryper
persistent count
if isempty(count); count = 0; end
count = count + 1;
t = getCurrentTask(); worker_number = t.ID;
c = worker_number * 10000 + count;
end
Vedere anche
Categorie
Scopri di più su Direct Search in Help Center e File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!