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

[Dan Howarth]

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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