[pymvpa] Mask in from_wizard generates no data.

[Nick Oosterhof]

On 28 Nov 2014, at 14:35, Thomas Nickson <thomas.nickson at gmail.com> wrote:

> When I construct a dataset using Dataset.from_wizard() and supply a brain mask all I get in return is a dataset that's all 0. 
> 
> I show the code below:
> 
> #get image data reshape and flatten
> rotatedImageData = rotateShape(getImageData(DATA_LOCATION))
> 
> #Get mask data
> mask = getImageData(MASK)#.nonzero()[0]
> 
> #Load dataset
> ds = Dataset.from_wizard(rotatedImageData, targets=metaData['diagnosesT1'], mask=mask)

Some ideas:
- are the mask and rotatedImageData of compatible shape?
- what is the datatype of mask? 
- how many voxels are non-zero in the mask?
- how many voxels are non-zero in rotatedImageData?
- have you tried using fmri_dataset instead?

If that doesn’t help in resolving the issue, could you provide the data you are using somewhere online so we can try to reproduce the issue.