dbstop if error not working

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Dylan
Dylan 2023-10-24
评论： Walter Roberson 2023-10-25
I would like matlab to enter debug mode when there is an error by calling dbstop if error, but it's not working.
In the following code for example, Matlab errors as expected but it doesn't enter debug mode. Are there any settings I should check? I don't see a debug menu.
dbstop if error
ferror123()
function ferror123() % this function errors
x = [];
x(4);
end
  2 个评论
Matt J
Matt J 2023-10-24
What happens if you use the Pause On Errors menu option instead of dbstop?
Dylan
Dylan 2023-10-24
That option doesn't seem to have any effect

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回答（2 个）

the cyclist
the cyclist 2023-10-24
ferror is the name of a built-in MATLAB function (which the debugger cannot open into). I expect it is being called, rather than your function.
Try renaming your function, and I expect the debugger will be triggered.
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Dylan
Dylan 2023-10-24
Ok I see. And just to confirm dbstop if caught error is expected to work in cell mode? That does enter debug mode for me when I do cmd + enter.
Walter Roberson
Walter Roberson 2023-10-25
Yes, dbstop if caught error is expected to work in cell mode -- but any line numbers reported might look strange.

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Walter Roberson
Walter Roberson 2023-10-24
if you are within a try/catch then use
dbstop if caught error
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Walter Roberson
Walter Roberson 2023-10-24
dbstop if error is only for unhandled errors when no try/catch is in effect.
dbstop if caught error is for all error cases... including "expected" errors.
What I mean by expected errors is that in order to deal with compatibility issues or with the possibility of hardware that might or might not be present, it is not uncommon for internal routines to use try/catch protecting a statement that is needed if conditions are right but can be skipped if they are not right.
As an example sometimes it is easier to code
try
delete(OldObject);
catch ME
end
rather than to code testing to see if OldObject exists and is in a deletable state
Dylan
Dylan 2023-10-24
Thanks.
Any reason why dbstop if caught error would work and not dbstop if error?

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