Unbalanced or unexpected parenthesis or bracket.

Hello. I have downloaded an old Matlab version. I a buddy send me a L-SLAM algorithm that he developed at Greek university. I want to test it but it throws this error: Unbalanced or unexpected parenthesis or bracket.

The error is in my main.m at 19 line

I am working with Windows XP using R2009A matlab version.

I will attach the file. If somebody wants the whole source code send me a email to [e-mail]

[Guillaume]

Any reason why you're using such an ancient version? It's obviously not compatibility concerns since the code you're running targets a more recent version.

Answer 1

[Thorsten]

If you have a pre-2009b version, the tilde could cause the error. Replace each tilde ~ with something like dummy or variable_not_used, and see if it works.

[Jorge Enrique Mesa Mosuqera]

Hello, I am not a good english speaker. Can you explain me what is the goal of tilde?? Can a replace it by a variable filled with zero?? I don't know the semantic meaning of tilde. Thanks for your answer. I have no reason to still using R2009A version. Just looking a way to work without reinstall Matlab. Can you give a example of a corrected statement??

[Thorsten]

"Use the ~ notation to denote missing inputs in function declarations, and missing outputs in calls to functions..."

You can replace any tilde used this way simply with "noticed" or "dummy", a variable that you never use and can clear immediately

In your main.m, replace

   [d,th,~]=getMeasure(map,realPosition,phi);

and

[~,midx]=max([prt.w]);

with

[d,th]=getMeasure(map,realPosition,phi);

(Because it is the final variable, simple delete the tilde.)

and

[notused, midx]=max([prt.w]);
clear notused

But be aware that the ~ is also used to as a negate operator, you you cannot do the replacement without checking each instance of the ~ carefully.

For more, see Loren explains the tilde introduced in 2009b.