[Eeglablist] Can't use breakpoints in EEGLAB?

[arno]

Dr James K. Kroger wrote:
> Hello Arno et al., I want to write some plugins and am trying to trace 
> through EEGLAB operation. I opened eeglab.m, pop_eegthresh.m, and 
> eegthresh.m in the matlab debugger. I set breakpoints in eegthresh.m. 
> Then I ran eeglab.m. The breakpoints (red dots) in eegthresh.m 
> disappeared as soon as the execution began. When the blue eeglab 
> interface came up, I loaded some data, then again set the breakpoints 
> in eegthresh.m. When I executed the menu item reject data epochs/reject 
> extreme values, the breakpoints again disappeared. Thus I can not watch 
> the data structure at 
>
> sweeps = size(signal(1,:),2)/pnts;
> signal = reshape(signal(electrodes,:), size(electrodes(:),1), pnts, 
> sweeps);
>   
The breakpoint might disapear because you are using menu callbacks. 
Being trained with old Matlab versions myself, I rarely set breakpoints 
myself. I just type on the command line "dbstop if error" which tells 
Matlab to stop if there is an error. Then I add an error in the code I 
want to look at (just some random code "asfdsafasdfads"). It is not as 
elegant as setting a breakpoint but it is more predictable.
> I want to do this so I can understand how the data is structured in 
> your code so I can step through it similarly. You seem not to use the 
> epoch structure (from epoching the data) and I'm confused about how you 
> are working with the data. The tutorial steps through epoching the data 
> for cleaning and some analyses but the code seems not to use the 
> epochs. I may address this in a separate question.
>   
The data structures are described in the tutorial at

http://www.sccn.ucsd.edu/eeglab/structtut/datastruct.html

along with a whole new (this year) section on scripting at

http://www.sccn.ucsd.edu/eeglab/scripttut/script_tutorial.html

I hope this help. To solve your breakpoint problem, you might want to 
ask a question on the google Matlab group.

Best,

Arno