[Mne_analysis] apply_proj question

[Alexandre Gramfort]

hi Dan,

if a proj is applied to data, the same proj will be applied to noise cov
and forward operator when localizing sources. Proj can be applied
multiple times, it has no effect to reapply them a second time.

HTH
Alex

On Tue, Nov 18, 2014 at 11:03 PM, Dan Howarth <d.c.howarth at gmail.com> wrote:
> Hello, in the documentation for apply_proj() (see link below) it states:
>
>> Once the projectors have been applied, they can no longer be removed. It
>> is usually not recommended to apply the projectors at too early stages, as
>> they are applied automatically later on (e.g. when computing inverse
>> solutions). Hint: using the copy method individual projection vectors can be
>> tested without affecting the original data. With evoked data, consider the
>> following example:
>
>
> Does this mean that if I apply the vectors that they will then be reapplied
> when I later compute the inverse?
>
> (http://martinos.org/mne/stable/generated/mne.io.RawFIFF.html#mne.io.RawFIFF.apply_proj)
>
> Thanks!
> Dan Howarth
>
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