-----Original Message----- From: numpy-discussion-bounces@scipy.org [mailto:numpy-discussion-bounces@scipy.org] On Behalf Of Elton Mendes Sent: Monday, November 27, 2006 13:57 To: numpy-discussion@scipy.org Subject: [Numpy-discussion] Precision in Python Hi. I'm having a precision problem in python Example:

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a = 5.14343434 b = round(a,1) b 5.0999999999999996

It´s possible to round the number exactly to 5.1 NO. 5.1 can not be represented exactly as a machine native float. The only way I know to represent this value exactly is to use the decimal module. Usually you do not want to do this. Nadav.