[Haskell-cafe] Re: Is logBase right?

Roberto López plastermoso at hotmail.com
Sat Aug 22 05:24:21 EDT 2009

If 4.0 / 2.0 was 1.9999999999999999999998, it would be ok?

The real value of log10 1000 is 3 (3.0). It can be represented with accuracy 
and it should be. 

You get the accuracy value in Perl, but there is the same problem in Python. 
It's a bit discouraging.

Eugene Kirpichov wrote:

> What do you consider to be the specification of logBase? Exact
> floating-point numbers don't exist, so it has to return an
> approximation. The standard doesn't give any guarantees as to the
> precision of the approximation. Is a precision of 0.00000000000004 not
> satisfactory for you?

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