[FieldTrip] Source reconstruction - finding the inverse of cross spectral density

[Eelke Spaak]

Hi Behzad,

See this issue on Github:
https://github.com/fieldtrip/fieldtrip/issues/1020 Bottom line (also
after a lot of discussion off-line among Robert, Jan-Mathijs, and
myself) is that there is no clear fact of the matter as to whether the
old or the new behaviour is correct (both are). The differences depend
on when and how regularization is applied. You're welcome to chime in
on the Github issue I mentioned.

Best,
Eelke

On Mon, 9 Mar 2020 at 11:11, Behzad Iravani <behzadiravani at gmail.com> wrote:
>
> Hello,
>
> Thanks a lot for your awesome toolbox, I had  a question regarding the estimation of inverse matrix of cross spectral density in source reconstruction pipeline. I noticed the method has been changed since 2018, that used to be using pinv function that seemingly similar to Matlab function , to fieldtrip function ft_inv that implemented different methods of estimating inverse matrix. However when we ran our script using the default configuration in newer than 2018 version of fieldtrip we get different result as we used to have in 2018. We would like to know if there is a specific change in ft_inv that we can not replicate the finding we used to get with pinv.
>
> Best regards
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