[FieldTrip] Problem with Beamformer demo

[Zoltan Juhasz]

Dear Sophie,
Thanks fort the update. I'll try again shortly with the latest version of
fieldtrip. Will let you know about the outcome.
Zoltan

On Wed, 4 Mar 2020, 13:44 Arana, S.L. (Sophie), <S.Arana at donders.ru.nl>
wrote:

> ​​​Dear Zoltan,
>
>
> I have indeed recently updated the beamformer tutorial. I just ran it with
> Matlab 2019a and the most recent Fieldtrip version (available on
> Github) and the figures look fine to me.
>
> Could you update your Fieldtrip version and try again?
>
>
> Best,
>
> Sophie
> ------------------------------
> *From:* fieldtrip <fieldtrip-bounces at science.ru.nl> on behalf of Zoltan
> Juhasz <z65.juhasz at gmail.com>
> *Sent:* Wednesday, March 4, 2020 11:38 AM
> *To:* FieldTrip discussion list
> *Subject:* Re: [FieldTrip] Problem with Beamformer demo
>
> Hi Jan-Mathijs,
>
> Thanks for getting back to me. I noticed that the documentation page has
> changed since my first email, so I created a new script and ran this again.
> This time no data is loaded from disk during computation, I am using what
> is produced by the script. The result is very disappointing, all figures
> are wrong. I have uploaded the script, the execution log and the output
> figures. Could you please check what could be wrong here?
>
> The link to the files is the same as before:
> https://drive.google.com/drive/folders/1XPZd5l3og1WAEt8dK6Bx7a9W8xgSzCMF?usp=sharing
> Matlab version: r2019a
> Fieldtrip version: 20190121
>
> Thanks,
> Zoltan
>
>
> On Thu, Feb 27, 2020 at 10:00 AM Schoffelen, J.M. (Jan Mathijs) <
> jan.schoffelen at donders.ru.nl> wrote:
>
>> Hi Zoltan,
>>
>>
>> Have you checked the values of the numbers in the functional data prior
>> to calling ft_sourceinterpolate? This would give an indication of whether
>> it is an interpolation issue or not.
>> I suspect that latter, because it seems that the interpolation is pulling
>> ‘activity values’ into areas in the volume for which no functional estimate
>> was provided.
>> This could happen if the specification of the ‘inside’ field in the
>> source variable, prior to interpolation, behaves unpredictably.
>> Whether or not this is specific to the Matlab version used, I don’t know.
>> Also, it is unclear what version of fieldtrip you are using.
>>
>> What I can see in your script, though, is that the sourcePost_nocon you
>> use to generate the first ‘correct’ 2 figures is loaded from disk, whereas
>> the other source structure (with the ‘incorrect’ interpolation) is not.
>>
>> Best wishes,
>> Jan-Mathijs
>>
>>
>> On 25 Feb 2020, at 13:46, Zoltan Juhasz <z65.juhasz at gmail.com> wrote:
>>
>> I have recently run into a problem while executing the Beamformer
>> Fieldtrip demo at http://www.fieldtriptoolbox.org/tutorial/beamformer/
>>
>> I am using the sample data set and the source code from this page but the
>> picture I get for the section "Source Analysis: Contrast activity to
>> another interval" is rather strange. I include here the 3 outputs, first
>> two are correct, third one is the problematic one. Also included is the
>> source. Matlab version used: R2019a. Could someone check whether it is a
>> script error or perhaps a change in Matlab that generates the odd result?
>>
>> links to figures and source:
>>
>> https://drive.google.com/drive/folders/1XPZd5l3og1WAEt8dK6Bx7a9W8xgSzCMF?usp=sharing
>>
>> Thanks,
>> Zoltan
>> University of Pannonia, Hungary
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