Hi,every body. I encounter the error while the scipy is testing . I wanna know why and how to fix it.(OSX lion 10.7.4) here is part of the respond: AssertionError: Not equal to tolerance rtol=4.44089e-13, atol=4.44089e-13 error for eigsh:general, typ=d, which=SA, sigma=0.5, mattype=asarray, OPpart=None, mode=buckling (mismatch 100.0%) x: array([[ 15.86892331, 0.0549568 ], [ 14.15864153, 0.31381369], [ 10.99691307, 0.37543458],... y: array([[ 3.19549052, 0.0549568 ], [ 2.79856422, 0.31381369], [ 1.67526354, 0.37543458],... ====================================================================== FAIL: test_arpack.test_symmetric_modes(True, <gen-symmetric>, 'd', 2, 'SA', None, 0.5, <function asarray at 0x10f5c2b90>, None, 'cayley') ---------------------------------------------------------------------- Traceback (most recent call last): File "/Library/Python/2.7/site-packages/nose-1.1.2-py2.7.egg/nose/case.py", line 197, in runTest self.test(*self.arg) File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/scipy/sparse/linalg/eigen/arpack/tests/test_arpack.py", line 249, in eval_evec assert_allclose(LHS, RHS, rtol=rtol, atol=atol, err_msg=err) File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/testing/utils.py", line 1178, in assert_allclose verbose=verbose, header=header) File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/testing/utils.py", line 644, in assert_array_compare raise AssertionError(msg) AssertionError: Not equal to tolerance rtol=4.44089e-13, atol=4.44089e-13 error for eigsh:general, typ=d, which=SA, sigma=0.5, mattype=asarray, OPpart=None, mode=cayley (mismatch 100.0%) x: array([[-0.36892684, -0.01935691], [-0.26850996, -0.11053158], [-0.40976156, -0.13223572],... y: array([[-0.43633077, -0.01935691], [-0.25161386, -0.11053158], [-0.36756684, -0.13223572],... ---------------------------------------------------------------------- Ran 5501 tests in 56.993s FAILED (KNOWNFAIL=13, SKIP=42, failures=76) <nose.result.TextTestResult run=5501 errors=0 failures=76>