[FieldTrip] cannot combine planar grads with ft_combineplaner

[Mads Jensen]

Hi Gianpaolo,

Thanks, that is good to know and much appreciated your two €-cents.

best,
mads

On 01/03/2014 03:09 PM, Demarchi, Gianpaolo wrote:
> Hi Mads,
> you’re not alone!
> In fact I was going to open a bug on that these days, since I’m getting
> similar (non) results.
>
> With a previous ft version (6499, so more than one year old), everything
> seems to work fine, i.e. I get (for a Vectorview 306 channel input)
> as a ft_combineplanar output:
>
> avgdatacmbOLD =
>
>            time: [1x1537 double]
>           label: {204x1 cell}
>            grad: [1x1 struct]
>             cfg: [1x1 struct]
>         fsample: 256
>      sampleinfo: [1 1537]
>             avg: [204x1537 double]
>          dimord: 'chan_time'
>
> so, correctly combined, whereas if I do the same with a recent (svn-ed)
> version, with the same input, I get:
>
> avgdatacmb =
>
>            time: [1x1537 double]
>           label: {306x1 cell}
>            grad: [1x1 struct]
>             cfg: [1x1 struct]
>         fsample: 256
>      sampleinfo: [1 1537]
>             avg: [306x1537 double]
>          dimord: ‘chan_time'
>
> so I get back my original, non combined, 306 channels …
>
> I tried to track the problem before opening a bug, and it seems that the
> problem lays in my input data label, which is:
>
>  >> avgdata.label
>
> ans =
>
>      'MEG0113'
>      'MEG0112'
>      'MEG0111'
>
> etc …
>
> The problem  seems to be around lines 102-ff of ft_combineplanar,
> since ft_senstype(data) on my data wrongly returns ‘neuromag306’ ( that
> are in principle ‘MEG 0113’ etc ...) instead of ‘neuromag306alt’ (
>   ‘MEG0113’ without spaces), and then in the following two lines
> sel_dH/sel_dV are empty, since there’s never a match between my data
> label (‘MEG0113’  …) and the output of ft_senstype/ft_senslabel (‘MEG
> 0113’ … with spaces).
> So, there’s something wrong in the ft_senstype step, but I didn’t have
> time to fully track it …
> @roboos: am I missing something obvious, or should I file a bug!?
>
> My two €-cents,
> Gianpaolo
>
>
> Il giorno 03/gen/2014, alle ore 11:44, Mads Jensen <mje.mads at gmail.com
> <mailto:mje.mads at gmail.com>> ha scritto:
>
>> Hi all,
>>
>> I have a problem with ft_combineplanar. It does not seem to combine the
>> planar gradiometors when called.
>>
>> I have tried with timelocked data and epoched data, both are the same.
>> However, grandaveraged data (ft_timelockgrandaverage) create a structure
>> with combined data. Does anybody have an idea what the problem might be
>> or how I can find the problem?
>>
>> I have Neuromag Triux data and is using the most recent Fieldtrip from
>> the git-repo.
>>
>> best wish,
>> mads
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>
>
>
>
>
>
>
>
>
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