[Eeglablist] Empty scalp topography: "save in matlab v7.3" causes error in std_readtopo for linked .icatopo files

[Makoto Miyakoshi]

Dear Kevin,

Thank you for sharing your finding from troubleshooting.
I certainly did not know it. I guess I've been using v6.5-compatible mode
all the time.

> I will submit a bug report but adding this to d-list will make this
Google-able for people who encounter this before it's patched.

Perfect. Very thoughtful. I highly appreciate your cooperation.

Makoto

On Thu, Aug 6, 2015 at 7:49 PM, Kevin Tan <kevintan at cmu.edu> wrote:

> Hi all,
>
> Selecting "write files in matlab v6.5" will get rid of "empty scalp
> topography" error when working with ICs in STUDY sets.
>
> Deselecting eeglab option "write files in matlab v6.5" (thus saving in
> matlab v7.3) causes error in line 103 of std_readtopo:
>
> Empty scalp topography file - also necessary for ERP polarity' 10 'Try
>> recomputing scalp topographies for components
>
>
> This only occurs in linked .icatopo files. When a set has the same
> components as other sets in a STUDY, std_precomp saves a "linked"
> .icatopo file to save space. The linked .icatopo is saved through
> std_savedat. The only difference in saving linked .icatopo in v6.5 versus
> v7.3 is the order of the fields "file" and "datafile", plus v6.5 is
> significantly smaller in size.
>
> For whatever reason, saving in v7.3 causes read error in std_readtopo,
> probably due to its subfunction correctfile. It also causes warnings that
> variables in lines 86-88 can't be found.
>
> This is on Ubuntu 14.4LTS & Matlab 2014a.
>
> I will submit a bug report but adding this to d-list will make this
> Google-able for people who encounter this before it's patched.
>
> --Kevin
> --
> Kevin Alastair M. Tan
> Lab Manager/Research Assistant
> Department of Psychology & Center for the Neural Basis of Cognition
> Carnegie Mellon University
>
> Baker Hall 434
> <https://www.google.com/maps/place/40%C2%B026%2729.5%22N+79%C2%B056%2744.0%22W/@40.4414869,-79.9455701,61m/data=!3m1!1e3!4m2!3m1!1s0x0:0x0>
>  | kevintan at cmu.edu | tarrlab.org/kevintan
> <http://tarrlabwiki.cnbc.cmu.edu/index.php/KevinTan>
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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