EEGLAB error in function std_readdata() at line 300

[stellafychang]

Description

I have tried to plot ERSP from a STUDY design using EEGLAB 2021.1 with MATLAB R2020b. There are two groups and one condition in the design, with unique subjects in each group. However, there was an error from a pop-up window indicated "std_readdata(line 300) error" with "Cannot handle conditions with different number of components for a given subject, This is not a bug (Error occurred in function std_readdata() at line 300)." I understand this error generally comes when there is a different IC decomposition within subjects (between conditions), but here we are using 100% unique subjects from two different diagnostic groups. The STUDY design picture The error picture

One observation (may or may not be related) is that ERSP plotting can work correctly if there is only one IC per subject in a cluster. Any idea or input would be appreciated.

The general steps I've taken are:

1. Load datasets into memory
2. Create study using loaded datasets
3. In STUDY gui, specify group of each subject
4. Precompute ERSP
5. Precluster/cluster/attempt to plot ERSP for a given cluster

#### Versions

OS version	[macOS Monterey Version 12.5]
Matlab version	[R2020b]
EEGLAB version	[2021.1]

[arnodelorme]

Apologies for the late reply. Yes, the error does not seem right. Unfortunately, I would need to see your STUDY to be able to track the problem. Any chance you can share it, even if it is really large?

[stellafychang]

I uploaded our STUDY to a google drive and shared a link to your UCSD email address. Please let me know if you haven't received the link. Thanks.

[arnodelorme]

OK, thanks. We will have a look.

Arno

[AlejandroCallara]

Dear eeglabers,

I encountered a similar issue. I think I solved by replacing some lines in the code. I hope it helps!

Here you can check my std_readdata.m

you can check the for cycle length at line 286 of my std_readdata.m: for iDat2 = 1:length(dataTmp{iDat1}(:))

the assignment of line 288: dataTmp{iDat1}{iDat2} = double.empty(0,0,0); % sometimes empty but all dim not 0

the condition of if statement at line 299: if any(any(compNumbers)

std_readdata.zip

[stellafychang]

I just shared the link for the datasets. Please let me know if you didn't receive the link through your UCSD email. Thank you.

[arnodelorme]

Thank you, I have added the fix. ccb275c9b