En Tue, 08 May 2007 14:14:58 -0300, Greg Corradini <[EMAIL PROTECTED]> escribió:
> I'm running descriptive stats on mileages from a database (float numbers, > about a million records). My sum returns 1.#QNAN, which I understand from > searching this forum is an error. > > While I'm looking for help in solving this problem, I'm more interested > in a > general explanation about the cause of this problem. Any ideas? If you are summing a million floating point numbers, using a naive algorithm may give you wrong results. Look for "Kahan summation algorithm" (even discussed some weeks ago in this group). -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
