[Mne_analysis] compute_proj_raw raised 'LinAlgError - SVD did not converge'

[Dan Howarth]

I should also note that I do not get this problem with the file if I try to
do the projection before I band pass and notch filter. Could band passing
and notch filtering before performing the computation result in a situation
in which the 'weight matrix' (I have no idea what that is reffering to in
this context) has negatives?

On Tue, Nov 18, 2014 at 2:13 PM, Dan Howarth <d.c.howarth at gmail.com> wrote:

> I tried using Anaconda but that didn't work out either.
>
> I found something interesting here:
> http://stackoverflow.com/questions/23533144/numpy-linalg-linalg-linalgerror-svd-did-not-converge
>
> Would it be possible that the 'weights' are negative?
>
> On Tue, Nov 18, 2014 at 11:34 AM, Eric Larson <larson.eric.d at gmail.com>
> wrote:
>
>> Unfortunately this is likely due to a bug in LAPACK:
>>
>> https://github.com/scipy/scipy/issues/3868
>>
>> You could try updating LAPACK, using `python-scipy` and `python-numpy`
>> from the Ubuntu repos, or possibly using Anaconda instead of the system
>> Python. Although it's ugly, it also works sometimes to just tweak the
>> inputs a tiny (seemingly trivial) amount, e.g. by including/excluding one
>> extra time point or epoch in calculations.
>>
>> Eric
>>
>>
>> On Tue, Nov 18, 2014 at 8:18 AM, Dan Howarth <d.c.howarth at gmail.com>
>> wrote:
>>
>>> In our lab we take a 'empty room' recording in which we turn on the MEG
>>> scanner when no one is in the room in order to further characterize the
>>> noise.
>>>
>>> I haven't had a problem in the past with this function, but for some
>>> reason its not working for some subjects and working for others.
>>>
>>> Here's the pipeline of the data:
>>>
>>> max filter -> band pass 1-150 > notch filter 60, 120 > then I compute
>>> the proj
>>>
>>> Python was installed on my ubuntu machine. I use virtualenv
>>>
>>> I used pip to install everything.
>>>
>>> scipy: 0.14.0
>>> numpy: 1.9.1
>>>
>>> On Tue, Nov 18, 2014 at 3:21 AM, Alexandre Gramfort <
>>> alexandre.gramfort at telecom-paristech.fr> wrote:
>>>
>>>> hi Dan,
>>>>
>>>> on what data did you apply this function?
>>>>
>>>> how did you install python+numpy+scipy?
>>>>
>>>> Alex
>>>>
>>>>
>>>> On Tue, Nov 18, 2014 at 12:26 AM, Dan Howarth <d.c.howarth at gmail.com>
>>>> wrote:
>>>> > Hello all,
>>>> >
>>>> > I am attempting to use compute_proj_raw
>>>> > (
>>>> http://martinos.org/mne/stable/generated/mne.compute_proj_raw.html?highlight=compute_proj_raw#mne.compute_proj_raw
>>>> )
>>>> >
>>>> > However, when I run the program I get the following error:
>>>> > https://gist.github.com/howarth/ae6289878337cb30af84
>>>> >
>>>> > This is from the stable version of mnepython using 'pip install mne'
>>>> which
>>>> > was done a few weeks ago.
>>>> >
>>>> > Thanks!
>>>> > Dan Howarth
>>>> >
>>>> >
>>>> >
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