How to use try/catch so that my program rerun until it correct ?

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Tuong Nguyen Minh
Tuong Nguyen Minh 2020-7-16
评论： Tuong Nguyen Minh 2020-7-17
Dear Matlab users,
I need to process a large amount of data using parfor and I am running into a problem where my program can sometime success, sometime not success
parfor i = 1:100
MyProgram
end
Is there anyway to utilize the try/catch statement so that everytime when my progragram run into some kind of error, the worker will
1/ Retry untill success
2/ Put a warning about the iteration i and then abandon the current job to move on
Thank you very much

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采纳的回答

Walter Roberson
Walter Roberson 2020-7-16
niters = 100;
status = logical(niters, 1);
message = cell(niters, 1);
parfor i = 1 : niters
blah blah blah
try
something
status(i) = true;
message{i} = [];
catch ME
status(i) = false;
message{i} = ME;
end
end
  6 个评论
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Walter Roberson
Walter Roberson 2020-7-16
You do not have to keep track of retries; you could just let it retry indefinitely. That would make the code a bit more simple.
niters = 100;
parfor i = 1 : niters
blah blah initialization
while true
blah blah anything that needs to be reset every retry
try
something
break; %you did not fail, so you can stop retrying.
end
end
end
Perhaps it might be more clear to you as
niters = 100;
parfor i = 1 : niters
blah blah initialization
failed = true;
while failed
blah blah anything that needs to be reset every retry
try
something
failed = false;
end
end
end
Tuong Nguyen Minh
Tuong Nguyen Minh 2020-7-17
Oh thank you very much, I did not know that this try catch command would even be that flexible. Your explanation is excellent and the code organization is very thoughful !

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