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I'm afraid I don't know.  I see some other messages on the list that seemed to link the problem to errors in the header file of the image.  Is that a possibility?  

Maybe somebody else has an idea.

Jeanette


On Sat, Aug 31, 2013 at 11:49 AM, Antonietta Pepe <[log in to unmask]> wrote:
Hi,

thanks Jeanette for your replay.
The fslnvols command confirmed that there are 64 3D images in my 4D file, exactly as it should.

Best regards,
Antonietta


On 31.8.2013 19:04, Jeanette Mumford wrote:
Hi,

If you run fslnvols on the 4D image that failed, how many volumes does it say are in that image?

Thanks,
Jeanette


On Fri, Aug 30, 2013 at 12:02 PM, Antonietta Pepe <[log in to unmask]> wrote:
Dear FSL users,

I have been experiencing the following error message:

    An exception has been thrown
    Logic error:- detected by Newmat: index error: requested indices = 1, 1
    MatrixType = Rect   # Rows = 0; # Cols = 1

while running the randomise command (randomise -i  input -o  output -1 -T -n 5000) for some of my 4D images (but not all). The error is persistent in some cases and it seams not be affected by the specific FSL version I am running ( I have tried with fsl-4.1.2, fsl-4.1.4, and fsl-5.0.2.2) or by the amount of virtual memory allocated. 

Does any of you have an idea on what is going on?

Best Regards,
Antonietta