Error using RESHAPE but I'm not using reshape

When executing one of my functions I'm getting:

Error using reshape To RESHAPE the number of elements must not change.

But my function doesn't even use reshape, any ideas of what is going on here? I mean, what other MATLAB function am I maybe using incorrectly that could be throwing this error?

[Rednar]

It stopped giving me the error and I didn't change anything. It was really weird, I just deleted a file that uses reshape but that it has nothing to do with the function I'm running and it's not even in the same folder. I don't know what happened but it's fine now.

[Jan]

Trust me Rednar, you did change not even not anything, but exactly the cause of the error. Matlab is 100% deterministic and you can be sure, that there was a reshape() in your code. The debugger Sean has suggested would have revealed where the problem occurs.

[Cedric]

Actually with JIT not being used in debugging sessions, I already observed differences in behavior, but not to the extent of using different functions internally.

[Rednar]

I didn't change a thing, I have no reason for lying. Maybe the bug was related with the fact that I was using the matlabcontrol java API and calling that MATLAB function a lot during the execution of a genetic algorithm. MATLAB was throwing me that error only sometimes and sometimes it worked fine. After several runs of my Java program the error stopped appearing in MATLAB. I really could not figure out what happened back there. Anyways, thanks a lot for the answers, I'll use the debugger in the future for sure if something goes wrong (even though usually I don't have to because MATLAB points me at the line where the error happened, only this time it wasn't).

[Cedric]

I don't think that Jan wanted to suggest that you were lying, but sometimes when we debug code, we check things out by e.g. commenting a few lines at different/random places, and we end up being unable of reproducing the bug when we want to ;-)

Answer 1

[Sean de Wolski]

dbstop if error

Then run your code. This will stop with the debugger on the offending line and you will be able to see what is happening.

[per isakson]

Make it a habit to use the debugger. It's good. Here are some links on debugging in Matlab

• Debugging in MATLAB
• Debugging session
• Debugging Approaches