Display the error containing line in .m file

Is there a method to display the error containing line in .m file, when the execution stops?

[Oleg Komarov]

Your question sounds like:

How to pinpoint the line that errors in a "highlight some lines + F9"?

Answer 1

[Jan]

Perhaps you are looking for:

dbstop if error

or if you want to catch error inside TRY-CATCH also:

dbstop if all error

[EDITED]: In modern Matlab versions this is documented:

dbstop if caught error

Then the failing line is highlighted in the editor automatically.

[Oleg Komarov]

Didn't know about all error!

[Jan]

@Oleg: It was documented in Matlab 6.5. I think it is equivalent to the current "dbstop if caught error".

[Oleg Komarov]

@Jan: actually it's not.

Seems like "dbstop if all error" is not documented anymore and it's funny how dbclear refers to "if error all".

[Jan]

@Oleg: I get in Matlab 2009a:

dbclear('all'); dbstop('if', 'all', 'error'); dbstatus

>> Stop if error, Stop if caught error.

Therefore I assume "dbstop if all error" is just a synonym.

[Oleg Komarov]

@Jan: 2011a http://www.mathworks.com/help/techdoc/ref/dbstop.html

'caught error' only for try-catch and it doesn't display the line if a simple highlight execute is performed on a script.

[Horia]

R2011a:

dbstop in file

dbstop in file at location

dbstop in file if expression

dbstop in file at location if expression

dbstop if condition

dbstop(s)

Mathworks seems to love play "hide and seek", until they come with another release...

[Oleg Komarov]

Anyways: 'dbstop if all error' works nevertheles on 2011a

[Horia]

But no longer appearing in "Help".

Answer 2

[Fangjun Jiang]

It is usually indicated in the error message.

Also, help dbstack.

[Horia]

The error message indicates the line in the function associated with the line in the .m file, not the .m file line resoinsuble for the error.

[Walter Roberson]

How do you define which line of code is "responsible" for a logic error that doesn't trigger an explicit fault for another several days?

[Walter Roberson]

The standard error message traceback shows not only any chain of library calls, but also the line in the user .m file

[Jan]

Under which circumstances does it (MATLAB?) show "error at" without a line number? Usually a line number is following.

[Horia]

The line number in the function or library used by Matlab, but not the one in the .m file.

Answer 3

[Paulo Silva]

After you get the error, execute this

l=lasterror;
fprintf('The last error was on line %d of the file called %s \n',...
         l.stack.line,l.stack.name)

[Oleg Komarov]

I get an empty stack if in a new .m file:

s = s(1)

l = lasterror