2010/8/24 Noufal Ibrahim <nou...@gmail.com>
>
> (I posted this to ChennaiPy but this list is wider so I'm reposting
> it).
>
> Arulalan T <arulal...@gmail.com> writes:
>
> > Dear All,
> >
> > I need one help.
> >
> > In python, I need to set the floating point precision as 2.
> >
> > I am getting the following output in python while adding two float nos.
>
>
> Often, you *need* to only display the result of your calculations with n
> decimal places. Is yours such a situation? If so, forget the number of
> decimal points during the computation and when printing format it as
> appropriate ("%.2f").
>
>
I am not just printing the float value.
> If you genuinely want to work without the floating point problem that
> you've indicated in your email, consider using the decimal module
>
> >>> import decimal
> >>> a = decimal.Decimal("79.73")
> >>> b = decimal.Decimal("0.5")
>
> >>> str(a + b)
>
> '80.23'
>
This is wrong ans.
>>> str(a+b)
'80'.
i.e. '80' only, not '80.23'.
And I dont want this in string. I need only in float value, that too exactly
in precision 2.
>
> [...]
>
> Can you tell us *why* this inaccuracy is hurting you?
>
>
I am doing project for Indian Meteorological Department using CDAT python
library.
Now I am plotting weather symbol markers on India Map at corresponding
latitude and longitude (in float) dynamically.
Due to inaccuracy floating value of latitude & logitude,
the position of markers are moved away from the exact position of the
stations on the map.
so I need float value in 2 precision without changing the value. Not in
string.
Any suggestions?
Thanks
>
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--
Regards,
Arulalan.T
Kanchi Linux User Group Rocks !
http://kanchilug.wordpress.com
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