Not same fprintf MATLAB and Linux Console

2017 10 10
1 个回答
回答已采纳
更新时间：2017 10 19
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0 个投票

Hello everybody,
I am trying to catch an error and I have made the following code in Matlab:
catch ME
% Some error occurred if you get here.
errorMessage1 = sprintf('Error in function %s()\n',ME.stack.name);
errorMessage2 = sprintf('Error in line %d\n',ME.stack(1).line);
errorMessage3 = sprintf('Error %s()\n',ME.message);
fprintf(2,'-----------------------------\n');
fprintf(2,'%s\n', errorMessage1);
fprintf(2,'-----------------------------\n');
fprintf(2,'%s\n', errorMessage2);
fprintf(2,'-----------------------------\n');
fprintf(2,'%s\n', errorMessage3);
The output of Matlab is the following one:
Error in hello()
Error in line 386
Error Index exceeds matrix dimensions.()
But, when I execute matlab from de Linux console:
./matlab < hello.m
I just get this output:
Index exceeds matrix dimensions
I cannot see the line or the .m I am running.
What kind of problem is this?
Thanks in advance,
Javi

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 采纳的回答

Jan
Jan 2017-10-10
编辑：Jan 2017-10-10

1 个投票

If you write the message to stderr by
fprintf(2, '%s\n', errorMessage1);
you have to catch this channel also. Try:
fprintf(1, '%s\n', errorMessage1);
Perhaps this works instead, but I cannot try it currently and hopefully someone corrects me:
matlab -r hello.m 2>&1

12 个评论
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Javier Naranjo
Javier Naranjo 2017-10-10
Can you explain me 2>&1 what exactly does?
I used fprintf(1,..) and it did not work...
Jan
Jan 2017-10-10
But 2>&1 works? I did not work with Linux for 20 years now...
This redirects the stream 2 (stderr) to 1 (stdout). See https://en.wikipedia.org/wiki/Redirection_(computing).
Do you see that I have used "matlab -r hello.m" instead of "matlab < hello.m"?
Javier Naranjo
Javier Naranjo 2017-10-10
Thanks for your help.
But it seems not to work...
I just get the fprintf of the error, not the line or function
Jan
Jan 2017-10-11
This is not clear: What exactly is "the fprintf of the error"? Do you get any output from stdout? I'm surprised that fprintf(1, ...) does not work.
Javier Naranjo
Javier Naranjo 2017-10-12
编辑：Javier Naranjo 2017-10-12
The problem is that when I execute the script in MATLAB and I get an error I can see the 3 fprintf in the console (MATLAB console) (errorMessage1, errorMessage2,...)
On the other hand, when I execute in the Linux Console ./matlab < hello.m and I get an error it does not show any of the errorMessage and I only get for example: Index exceeds matrix dimensions.
I do not see the fprintf of the line or the function.
Thanks for your help
Javier Naranjo
Javier Naranjo 2017-10-17
编辑：Javier Naranjo 2017-10-17
Thanks you so much! It worked! I am running hello.m from another script that opens and closes a diary.
The little problem now is that I get:
No MATLAB command specified
in the Linux Console when I run:
sudo ./matlab -r < getOutput.m -nosplash -nodesktop
It seems to be a warning... any idea how to solve this issue?
Thanks again!
Jan
Jan 2017-10-17
Try
./matlab -r getOutput.m -nosplash -nodesktop
without the <
Javier Naranjo
Javier Naranjo 2017-10-17
编辑：Javier Naranjo 2017-10-17
If I do not write down "<" and I execute
./matlab -r folder1/getOutput.m -nosplash -nodesktop
It turns:
not variable or function folder1
and it stays in an infinite loop.
Jan
Jan 2017-10-18
Try to use quotes and provide an absolute path:
./matlab -r "~/folder1/getOutput.m" -nosplash -nodesktop
Or single quotes ' ?
Javier Naranjo
Javier Naranjo 2017-10-19
/folder1/getOutput.m
|
Error: Unexpected MATLAB operator.
I tried with single and doble quotes and it did not work.. When I write down double it says too many input arguments.
Thanks
Jan
Jan 2017-10-19
编辑：Jan 2017-10-19
@Javier: Sorry, my mistake.
./matlab -r "cd('~/folder1'); getOutput" -nosplash -nodesktop
The parameter of the -r command must contain a valid Matlab command, not the path of a m-function. You can find more details in the documentation: https://www.mathworks.com/help/matlab/matlab_env/startup-options.html

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