number comparison problem

David Lees debl2Nonosapmmyyy at bellatlantic.net
Wed Oct 16 05:35:31 CEST 2002


You are assuming that the default print is displaying all the digits in
your number.  Try this:
>>> x=0.132945911028
>>> y=x+10**(-13)
>>> print x,y
0.132945911028 0.132945911028
>>> print y>x
1

You might want to go look at the
http://www.python.org/doc/current/tut/node14.html

david lees


Chris Fonnesbeck wrote:
> 
> I am using python to code an optimization function that requires
> numbers to be compared to one another, as is common in many
> algorithms.  However, the comparison operators (<,>,<=,>=,==) seem not
> to be working properly.  Regard the following:
> 
> >>> print fb,fc
> 
> 0.132945911028 0.132945911028
> 
> >>> print fb>fc
> 
> 1
> 
> These numbers look the same to me; what do I have to do to be able to
> test numbers accurately in python?
> 
> TIA,
> cjf



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