[pymvpa] Question about NiftiDataset

[Valentin Haenel]

Hi,

when i look at the documentation for NiftiDataset, i see that samples has a
default of None. This seems to suggest i could use:

NiftiDataset()

to instantiate an empty dataset, which however raises a ValueError

My use case is such that i want to instantiate an empty dataset and then use
"+=" to successively populate the dataset in a loop.

My current idiom is really quite ugly and looks like:

ds = None

-- looping stuff ---

    if ds is None:
        ds =  NiftiDataset(samples=abs_filename(betafile),
            labels=label , chunks=chunk , mask=m)
    else:
        ds +=  NiftiDataset(samples=abs_filename(betafile),
            labels=label , chunks=chunk , mask=m)


Thanks for your advice.

V-