[Mne_analysis] mne_do_forward solution fails reading tag directory

[Matti Hamalainen]

Hi Vincent,

These instruction do not apply here but rather to raw data files, which will be then missing part of the data after the fix which is not so bad.

All the files needed by mne_do_forward_solution need to be intact. What is the exact output you get up to the error about fif file reading?

- Matti 

On Oct 10, 2013, at 6:51 PM, Jon Houck <jhouck at unm.edu> wrote:

> I have some old notes from Neuromag on this, which are quoted below.  As Alex suggested, it may be that a copy failed.  That was the case for our subject -- I've never had to actually follow the instructions below.  Hope this is helpful.
> 
> Jon
> 
> 
> 
> This symptom usually comes when the tail of the file is missing. This typically happens when somebody copies a file and disk comes full or the copy is stopped in the middle.
> 
> To fix the file: in principle one needs to set the pointer to directory to -1 to prevent software to try to access the directory, remove all jumps to nonexisting tail data, add all "closing parenthesis" (end of block markers) to end of file to make its structure consistent again (graph can open files that are "open" at the end, so the last step is not absolutely necessary). If the missing tail is not very short, you are likely to loose digitization, HPI measurement, patient info and some other pieces that are glued to the end when the file is saved.
> 
> 
> 
> 
> 
> 
> 
> On Thu, Oct 10, 2013 at 3:59 PM, Alexandre Gramfort <alexandre.gramfort at telecom-paristech.fr> wrote:
> hi Vincent,
> 
> any chance a fif file was corrupted?
> 
> Alex
> 
> 
> On Thu, Oct 10, 2013 at 10:55 PM, Vincent Rupp Jr.
> <vincentruppjr at gmail.com> wrote:
> > When attempting to run mne_do_forward_solution on a subject, forward
> > computation fails with the message "Could not read tag directory!". Could
> > anyone tell me what this error message is referring to?
> >
> > Best wishes,
> >
> > Vincent Rupp Jr
> >
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> -- 
> Jon M. Houck, Ph.D.
> Research Assistant Professor
> Center on Alcoholism, Substance Abuse, and Addictions
> Department of Psychology
> University of New Mexico
> Albuquerque, NM 87131
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---------

Matti Hamalainen, Ph.D.
Athinoula A. Martinos Center for Biomedical Imaging
Massachusetts General Hospital

msh at nmr.mgh.harvard.edu
mhamalainen at partners.org






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