[Mne_analysis] [mne-python] strange behavior of raw.save()

[Denis-Alexander Engemann]

Ok. self._preload

2012/9/9 Denis-Alexander Engemann <d.engemann at fz-juelich.de>:
> Ok, I tried the following:
>
> I added
>
> if fname == self.info['filename'] and not hasattr(self,'_data'):
>             raise ValueError('Invalid operation. Either read data with preload '
>                                     'option or use alternative file name')
>
> to Raw.save
>
> Hower, in case the data is preloaded the file still breaks...
>
>
>
>
> 2012/9/8 Denis-Alexander Engemann <d.engemann at fz-juelich.de>:
>> Thanks Martin,
>>
>> that must be it.
>> I actually I was testing a new command line tool of mine for mass riff
>> export / augmentation  / conversion
>> And in one of the use cases I simply wanted to change the info
>> structure without loading the data.
>> So this means I can either preload the data or work around it by e.g.
>> iterative renaming.
>>
>> To prevent users from tnings like that one could add something like
>>
>> raw.save(fname)
>>
>> (...)
>>
>> if fname == self.raw.info['filename'] and not self.preload:
>>     raise ValueError("Invalid operation "
>>                             "Either load data or use alternative file name")
>>
>>
>> Wdyt?
>>
>> Cheers,
>> Denis
>>
>>
>>
>> 2012/9/8 Martin Luessi <mluessi at nmr.mgh.harvard.edu>:
>>> Hi Denis,
>>>
>>> Are you by any chance saving the raw file to the same file from where you
>>> read it? I.e., something like
>>>
>>> raw = Raw('test_raw.fif')
>>> ..
>>> raw.save('test_raw.fif')
>>>
>>> Unless you use preload=True, this won't work since raw.save() will read from
>>> the file and at the same time overwrite it. We should add a check such that
>>> it throws and exception with a explanatory error message if one tries to do
>>> this.
>>>
>>> Martin
>>>
>>>
>>> On 09/08/12 16:04, Denis-Alexander Engemann wrote:
>>>>
>>>> Hi all,
>>>>
>>>> on saving a raw file using the instance method save() I get the
>>>> following error message.
>>>>
>>>> http://pastebin.com/g66H4svV
>>>>
>>>> After that the file is not readable anymore ( the same error message
>>>> will appear as Raw.__init__() is called. )
>>>>
>>>> If I use an alternative file name this does not happen.
>>>>
>>>> a) what is the reason for that / what does it actually tell, and
>>>>
>>>> b) shouldn't that rather throw an exception than messing up the original
>>>> file?
>>>>
>>>>
>>>> Cheers,
>>>> Denis
>>>>
>>>>
>>>>
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