[pymvpa] ERNiftiDataset

Michael Hanke michael.hanke at gmail.com
Wed Jul 1 16:43:32 UTC 2009

Hi Matthew,

On Wed, Jul 01, 2009 at 11:59:26AM -0400, Matthew Cieslak wrote:
> Hi,
> I just switched from using the transformWithBoxcar function in conjunction
> with fsl evfiles to make big files of concatenated samples with labels and
> chunks specified in an outside text file to using the ERNiftiDataset class
> (which is really nice!) with lists of Event objects and am having trouble
> running a searchlight on it.  I get the error
> ValueError: Searchlight only works with MappedDatasets that has metric
> assigned.
> Is it not possible to use a searchlight when samples have multiple time
> points? I had no trouble getting svm weights for the same ERNiftiDatasets,
> so I am a little confused

Depending on the exact way you are using this dataset type you might
actually get two datasets in one -- one of those has no metric assigned,
because it is not fMRI data. To be able to figure out what is going on
it would be good if you could post the relevant code snippets and an
example of your event definitions.


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