[Neuroimaging] failure using DIPY Free Water Elimination DTI

[Ping-Hong Yeh]

Hi Dipy Users,

 I've ran into errors "Eigenvalues did not  converge" when using the free
water elimination model,
and here is the error message:

  File
"/Users/yehp/anaconda3/lib/python3.6/site-packages/dipy/reconst/dti.py",
line 1615, in _decompose_tensor_nan
    min_diffusivity=min_diffusivity)
  File
"/Users/yehp/anaconda3/lib/python3.6/site-packages/dipy/reconst/dti.py",
line 1946, in decompose_tensor
    eigenvals, eigenvecs = eigh(tensor)
  File
"/Users/yehp/anaconda3/lib/python3.6/site-packages/dipy/utils/arrfuncs.py",
line 128, in eigh
    return np.linalg.eigh(a, UPLO)
  File
"/Users/yehp/anaconda3/lib/python3.6/site-packages/numpy/linalg/linalg.py",
line 1291, in eigh
    w, vt = gufunc(a, signature=signature, extobj=extobj)
  File
"/Users/yehp/anaconda3/lib/python3.6/site-packages/numpy/linalg/linalg.py",
line 95, in _raise_linalgerror_eigenvalues_nonconvergence
    raise LinAlgError("Eigenvalues did not converge")
numpy.linalg.linalg.LinAlgError: Eigenvalues did not converge


Any suggestions?

Thank you.

Ping
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/neuroimaging/attachments/20181227/58d17683/attachment.html>