This fails because numpy uses the function `cacosh` from the libm and on RHEL6 this function has a bug. As long as you don't care about getting the sign right at the branch cut in this function, then it's harmless. If you do care, the easiest solution will be to install something like anaconda that does not link against the relatively old libm that RHEL6 ships. On Mon, Nov 9, 2015 at 1:11 AM, Lintula <bugreports2005@cs.tut.fi> wrote:

Hello,

I'm setting up numpy 1.10.1 on RHEL6 (python 2.6.6, atlas-3.8.4, lapack-3.2.1, gcc-4.4.7), and this test fails for me. I notice that someone else has had the same at https://github.com/numpy/numpy/issues/6063 in July.

Is this harmless or is it of concern?

====================================================================== FAIL: test_umath.TestComplexFunctions.test_branch_cuts(<ufunc 'arccosh'>, [-1, 0.5], [1j, 1j], 1, -1, True) ---------------------------------------------------------------------- Traceback (most recent call last): File "/usr/lib/python2.6/site-packages/nose/case.py", line 182, in runTest self.test(*self.arg) File "/usr/lib64/python2.6/site-packages/numpy/core/tests/test_umath.py", line 1748, in _check_branch_cut assert_(np.all(np.absolute(y0.imag - yp.imag) < atol), (y0, yp)) File "/usr/lib64/python2.6/site-packages/numpy/testing/utils.py", line 53, in assert_ raise AssertionError(smsg) AssertionError: (array([ 0.00000000e+00+3.14159265j, 1.11022302e-16-1.04719755j]), array([ 4.71216091e-07+3.14159218j, 1.28119737e-13+1.04719755j]))

---------------------------------------------------------------------- Ran 5955 tests in 64.284s

FAILED (KNOWNFAIL=3, SKIP=2, failures=1) <nose.result.TextTestResult run=5955 errors=0 failures=1> _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org https://mail.scipy.org/mailman/listinfo/numpy-discussion