I've implemented several small improvements for floats and the math module. You can find a description and the patches in our bug tracker:
http://bugs.python.org/issue1635 http://bugs.python.org/issue1640 Summary: * Full and platform independent round trip for +/-inf and nan. Before the patch the round trip didn't work on Windows and Windows returned different repr() for nan and inf (1.#INF and -1.#IND). >>> 1e500 inf >>> -1e500 -inf >>> 1e500 * 0. nan >>> float("nan") nan >>> float("inf") inf >>> float("-inf") -inf * math.isnan() and math.isinf() functions. The Py_IS_NAN and Py_IS_INFINITY macros now use isinf and isnan on platforms that support the functions. Although they are C99 functions they are also available on GNU89 (C89 + GNU extensions) and other platforms. We already use them on Windows. * math.sign() function >>> math.sign(42) 1 >>> math.sign(-42) -1 >>> math.sign(0) 0 On platforms with full IEEE 754 semantics and copysign() support: >>> math.sign(0.0) 1 >>> math.sign(-0.0) -1 * Py_MATH_PI and Py_MATH_E macros with long double precision for future use. * 1st and 2nd kind Bessel functions (j0, j1. jn, y0, y1, yn), error functions (erf, erfc) and gamma function (lgamma with sign). They are available in most libm libraries. Please review the patches and comment on them. Christian _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
