2008/9/29 Pauli Virtanen <[EMAIL PROTECTED]>: > Mon, 29 Sep 2008 12:07:53 +0200, Matthieu Brucher wrote: > >>>>>> np.log(-1 + 0j) >>> 3.1415926535897931j >>>>>> np.log(-1 - 1e-99j) >>> -3.1415926535897931j >>>>>> np.log(-1 + 1e-99j) >>> 3.1415926535897931j >>> >>> I'd guess this is typically harmless, but may lead to problems if your >>> code relies on the choice of branch at the branch cut. >>> >>> Could you check if this is really the case? If log seems to work OK, >>> then it's a problem with the test and not the functions. >> >> The result is what you expected. > > Do you mean that the problem is with the test, or with the branch cut of > log?
I don't know, but the results are : >>> np.log(-1 + 0j) 3.1415926535897931j >>> np.log(-1 - 1e-99j) -3.1415926535897931j >>> np.log(-1 + 1e-99j) 3.1415926535897931j Matthieu -- French PhD student Information System Engineer Website: http://matthieu-brucher.developpez.com/ Blogs: http://matt.eifelle.com and http://blog.developpez.com/?blog=92 LinkedIn: http://www.linkedin.com/in/matthieubrucher _______________________________________________ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
