Feature Requests item #1163139, was opened at 2005-03-14 12:24 Message generated for change (Comment added) made by rhettinger You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=355470&aid=1163139&group_id=5470
Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Python Library Group: None >Status: Closed >Resolution: Rejected Priority: 5 Submitted By: Keith Briggs (kbriggs) Assigned to: Nobody/Anonymous (nobody) Summary: expm1 and log1p Initial Comment: Could we please have expm1 and log1p interfaced in the math module (where these exist in libm)? These are essential for any serious mathematical applications. lgamma would be nice too. ---------------------------------------------------------------------- >Comment By: Raymond Hettinger (rhettinger) Date: 2005-06-02 20:34 Message: Logged In: YES user_id=80475 For the reasons mentioned by Tim, closing this RFE. ---------------------------------------------------------------------- Comment By: Tim Peters (tim_one) Date: 2005-03-14 13:20 Message: Logged In: YES user_id=31435 Python code intends to be portable, and the math module hasn't yet included any platform-specific functions. I used to write math libraries for a living, so I know about netlib <wink>. If that's the intended approach to portability , it still needs someone to volunteer to do all the non-trivial coding, testing, doc, license-hassling, and x-platform config work. Won't be me because I can't make time for it. Note that you could easily write an extension module exposing these functions on _your_ platform (assuming your platform C supplies them). ---------------------------------------------------------------------- Comment By: Keith Briggs (kbriggs) Date: 2005-03-14 12:59 Message: Logged In: YES user_id=888261 Is there an objection in principle to including something in the math module only if it is found in the system's libm? If so, a solution would be to use a C implementation of expm1 when it is not already supplied, for example from fdlibm: http://www.netlib.org/fdlibm/ ---------------------------------------------------------------------- Comment By: Tim Peters (tim_one) Date: 2005-03-14 12:39 Message: Logged In: YES user_id=31435 Hard one, since none of those functions are required by the C89 standard, Python doesn't require more than C89, and the math module overwhelmingly consists of thin wrappers around the platform C's implementations. When C99 is universally available, then it will be easy. Before then, someone would have to volunteer non-trivial work (for example, Microsoft's C runtime doesn't supply any of these -- it's a x-platform mess). ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=355470&aid=1163139&group_id=5470 _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
