[Mne_analysis] specify noise covariance rank in MNE-Python?

[Alexandre Gramfort]

hi,

yes the manual setting of the rank has not be exposed to users in
MNE-Python. This should be fixed to address the use case martin
reported.

@mluessi do you give it a shot?

Alex


On Thu, Dec 11, 2014 at 1:03 PM, Denis A. Engemann
<denis.engemann at gmail.com> wrote:
> Hi Martin to me this makes absolutely sense. This is also related to PR #1671 on MNE-Python. Likewise, we could have a rank parameter for spatial whitening.
>
> +1 for taking into account the rank (due to sss | proj | ica)
>
>> On 11 Dec 2014, at 12:47, Martin Luessi <mluessi at nmr.mgh.harvard.edu> wrote:
>>
>> Hi,
>>
>> The mne_inverse_operator command has an option to specify the rank of
>> the covariance matrix. This is useful when e.g. maxfilter has been
>> applied to the data and the rank has been reduced. It seems like this
>> option is currently missing from MNE-Python; we are computing an inverse
>> operator using a covariance matrix estimated from data with maxfilter
>> applied but the detected rank is 200  (only gradiometers) instead of 64.
>>
>> Is there a reason for not having this option in MNE-Python or would it
>> make sense to add it?
>>
>> Best,
>>
>> Martin
>>
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