Hi,
in the docstring of eigh (Lib/linalg/decomp.py, around line 180):
"""
[...]
Outputs:
w,v -- w: eigenvalues, v: eigenvectors [for eigvals_only == False]
w -- eigenvalues [for eigvals_only == True (default)].
[...]
"""
but the default is eigvals_only == False.
cu, Johannes