parfor with progress report
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I would like my parfor loop to count how many of the indices have been handled and display this information during the computations. However, the first code below does not work as MATLAB forces $c$ to be temporary and the second does not work because MATLAB seems to create independent copies of the counting object for each worker.
First try:
c=0;
A=zeros(10,1);
parfor i=1:10
A(i)=foo(i);
c=c+1;
c/10
end
--> Error when trying to run, because c is uninitialized.
Second try:
classdef progress <handle
properties
N;
c;
end
methods
function obj=progress(N)
obj.N=N;
obj.c=0;
end
function count(obj)
obj.c=obj.c+1;
fprintf('%f',obj.c/obj.N);
end
end
methods(Static)
function test()
c=progress(10);
parfor( i=1:10,3)
c.count();
end
end
end
end
--> Output:
>> progress.test() 0.1000000.2000000.300000 0.1000000.2000000.3000000.400000 0.1000000.2000000.300000
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