[Pkg-exppsy-pynifti] Converting NiftiImage to ndarray gives "ValueError: dimensions too large"

[Nicholas Dowson]

Hello,

The following code using pynifti gives me an error (ValueError: dimensions too large):
from nifti import *
from numpy import *
mynifti = NiftiImage('T1noise3bias0.nii')
myarray = mynifti.getDataArray()

This is very strange because the number of voxels is low:
In [11]: mynifti.nvox
Out[11]: 7109137
In [12]: mynifti.extent
Out[12]: (181, 217, 181)

Other information:
I am running Ubuntu 8.10, with the standard packages for python, numpy and scipy installed. I tried the above on ipython and python. Python just segfaults. I get the same error if I use getDataArray()

Here is the full output:
<BEGIN of output>
ERROR: An unexpected error occurred while tokenizing input
The following traceback may be corrupted or invalid
The error message is: ('EOF in multi-line statement', (60, 0))

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)

/home/dow178/extDownload/lib/VTKbuild/<ipython console> in <module>()

/var/lib/python-support/python2.5/nifti/niftiimage.pyc in asarray(self, copy)
    217         """
    218         # make sure data is accessible
--> 219         self.load()
    220 
    221         if copy:

/var/lib/python-support/python2.5/nifti/niftiimage.pyc in load(self)
    174             raise RuntimeError, "Unable to load image data."
    175 
--> 176         self._data = nifticlib.wrapImageDataWithArray(self.raw_nimg)
    177 
    178 

ValueError: dimensions too large.

 <END of Output>

Does anyone know why this is occuring?

I tried installing the libnifti-dev package and searching for the wrapImageDataWithArray function to glean some information - but it doesn't live there. Any ideas where the c++ source code for wrapImageDataWithArray is?

Many thanks in advance,
Nick





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