[Numpy-discussion] Precision in Python

Nadav Horesh nadavh at visionsense.com
Wed Dec 6 00:52:35 CST 2006


 

 

-----Original Message-----
From: numpy-discussion-bounces at scipy.org [mailto:numpy-discussion-bounces at scipy.org] On Behalf Of Elton Mendes
Sent: Monday, November 27, 2006 13:57
To: numpy-discussion at scipy.org
Subject: [Numpy-discussion] Precision in Python

 

Hi.
I'm having a precision problem in python

Example:


>>> 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.

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