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

[Eric Larson]

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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