Hi, I found an unexpected difference from numpy 1.7.1 and 1.8.0rc2 with Python 3.3.2 on Ubuntu 12.04 (amd64). Here is the test program:
import numpy as np print(np.__version__) K = np.array([[ 0. , 0. , 0. , 0. ], [-0.33333333, 0. , 0. , 0. ], [ 0.33333333, -0.33333333, 0. , 0. ], [ 0.33333333, -0.33333333, 0.33333333, 0. ]]) w, V = np.linalg.eigh(K) print('w') print(w) with numpy 1.7.1: 1.7.1 w [-0.33333333 -0.33333333 -0.33333333 0.99999999] with numpy 1.8.0rc2: 1.8.0rc2 w [ 0. 0. 0. 0.] Apologies if this is my mistake! -Andrew
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