Error message in the console when using batch
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Im using batch, where we call the myFUN 30 times (this function procces an image)
for k=1:30
job(nn)=batch(@myFUN,1,{matfiles,k,Parameters,base_folder,saveflag,Plot_Figures},'CaptureDiary',true);
end
In that function I have an error message that tells me that this image could not be processed for some reason
fprintf(fileID,'%s Number of initial sources=0, unprocessed roi\n',Sample.TagName);
How can I make that error message appear in the console when I am using batch?
2 个评论
Raymond Norris
2025-2-21
@Sandra Martinez all good answers here.
Just to clarify, is the "error message" you're talking about the fprintf statement you're showing? That is, you want the fprintf statement to be displayed in your MATLAB console (as a pseudo error)?
Or was the call to fprintf erroring out (perhaps Sample is undefined) and you want to display the MATLAB error?
Sandra Martinez
2025-2-22
采纳的回答
Walter Roberson
2025-2-6
0 个投票
fetchOutputs() in a try/catch environment. It will succeed if there was no error, and will throw an error if there was an error encountered. Inside the catch block, check the Tasks.Error property of the job; it should be error information.
Tip
To see if any of the tasks on the job j failed after encountering an error, check if j.Tasks.Error is empty. If the returned array is empty, none of the tasks on the job j encountered any errors.
If some tasks completed successfully, you can use the OutputArguments property of a task to access the output arguments of that task directly.
4 个评论
Sandra Martinez
2025-2-6
Walter Roberson
2025-2-6
In your catch block detect the particular error() that you emit when the image is not readable. Display the relevant error message. Otherwise display some other error message.
Walter Roberson
2025-2-6
The alternative is to emit the error message as text, and to pick it up by examining the Diary property of the job. However, this will pick up all text emitted. (You could in theory post-process the text picked up from Diary)
There is no "display in console" type of function.
As an alternative, you might consider using parfeval() instead of batch(). Using parfeval() would allow you to construct parallel.pool.DataQueue or parallel.pool.PollableDataQueue objects, which could then be used to send text back to the client .
Sandra Martinez
2025-2-22
更多回答（1 个）
Edric Ellis
2025-2-7
0 个投票
As mentioned by @Walter Roberson you can use the Diary property of the job to view this information. Another (more intrusive) option if you wish is to use ValueStore to record the messages. There's an example on that documentation page showing how a batch job can record progress into the ValueStore, and also how the client can register a callback function that gets called automatically whenever an entry is added to the ValueStore.
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