That's great news. Thanks again for your assistance.
-Jim
On Fri, 14 Dec 2007 12:47:39 +0000, Steve Smith <[log in to unmask]> wrote:
>Hi - thanks, I've checked into this. This is a result of the stats
>linear algebra being too "robust": the cope and varcope for your
>contrast using an empty EV are both zero, hence the Zstats end up
>being non-zero. Hence you can just disregard this contrast's results
>without worrying about the others. We'll fix this (i.e. force the Z to
>be zero in such cases) for a future release.
>
>Cheers, Steve.
>
>
>On 13 Dec 2007, at 03:05, James Porter wrote:
>
>> Thanks for taking a look at this. I've uploaded the version where I
>> chose
>> "Empty (all zeros)." The ID is 407028. If you'd like to take a look
>> at the
>> version where the EV is defined by an empty 3-column text file I can
>> send
>> that up, too. However, the results are identical. Oh, and yes, I am
>> using
>> 4.0.2.
>>
>> Thanks again,
>> Jim
>>
>>
>> On Wed, 12 Dec 2007 10:04:00 +0000, Steve Smith
>> <[log in to unmask]> wrote:
>>
>>> Hi - are you using FSL 4.0.2 ? I just tried this here and it gave an
>>> empty image, as it should.
>>> If you'd like to upload the complete FEAT directory, we can take a
>>> look.
>>>
>>> Please upload the files in a single compressed tarfile to
>>> http://www.fmrib.ox.ac.uk/cgi-bin/upload.cgi
>>> And then email me the upload ID.
>>>
>>>
>>> Cheers, Steve.
>>>
>>> On 12 Dec 2007, at 04:00, James N. Porter wrote:
>>>
>>>> Hello FSL Folks-
>>>>
>>>> When I run FEAT and choose an EV to be zeroed out or pass in a 3-
>>>> column file that has no moments of interest, I get out a statistical
>>>> map that contains noise rather than nothing. My understanding was
>>>> that a zeroed out EV would produce nothing but a placeholder for
>>>> convenience purposes. Is this indicative of a larger problem or not
>>>> a big deal?
>>>>
>>>> http://www.tc.umn.edu/~norb0062/rendered_thresh_zstat4.png
>>>>
>>>> Thanks,
>>>>
>>>> --
>>>> Jim Porter
>>>> Graduate Student
>>>> Clinical Science & Psychopathology Research
>>>> University of Minnesota
>>>>
>>>
>>>
>>> ---------------------------------------------------------------------------
>>> Stephen M. Smith, Professor of Biomedical Engineering
>>> Associate Director, Oxford University FMRIB Centre
>>>
>>> FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
>>> +44 (0) 1865 222726 (fax 222717)
>>> [log in to unmask] http://www.fmrib.ox.ac.uk/~steve
>>> ---------------------------------------------------------------------------
>>> =
>>> =
>>> =
>>> =
>>> =====================================================================
>>
>
>
>---------------------------------------------------------------------------
>Stephen M. Smith, Professor of Biomedical Engineering
>Associate Director, Oxford University FMRIB Centre
>
>FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
>+44 (0) 1865 222726 (fax 222717)
>[log in to unmask] http://www.fmrib.ox.ac.uk/~steve
>---------------------------------------------------------------------------
>=========================================================================
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