@@ -673,6 +673,13 @@ def _check_branch_cut(f, x0, dx, re_sign=1, im_sign=-1, sig_zero_ok=False, assert np.all(np.absolute(y0.real - ym.real*re_sign) < atol), (y0, ym) assert np.all(np.absolute(y0.imag - ym.imag*im_sign) < atol), (y0, ym) +def test_copysign(): + assert np.copysign(1, -1) == -1 + assert 1 / np.copysign(0, -1) < 0 + assert 1 / np.copysign(0, 1) > 0 + assert np.signbit(np.copysign(np.nan, -1)) + assert not np.signbit(np.copysign(np.nan, 1)) + def test_pos_nan(): """Check np.nan is a positive nan.""" assert np.signbit(np.nan) == 0 numpy/core/tests/test_umath.py 5fd6ae6f7f236cc287601c4b34171667800c762d cdavid cdavid@94b884b6-d6fd-0310-90d3-974f1d3f35e1 http://github.com/cournape/numpy/commit/3b4a07454387baebec71b9d445b5911045c210f2 3b4a07454387baebec71b9d445b5911045c210f2 2009-07-01T07:23:24-07:00 2009-07-01T07:23:24-07:00 Add basic tests for copysign. git-svn-id: http://svn.scipy.org/svn/numpy/trunk@7092 94b884b6-d6fd-0310-90d3-974f1d3f35e1 7a5ab1daa5869489cc980e6ccbd1e6e09ad23461 cdavid cdavid@94b884b6-d6fd-0310-90d3-974f1d3f35e1