Any decimal number that goes into maxima turns into a 53-bit floating
point number (at least by default), which then turns into a 53 bit
MPFR coming out. The reason all the trailing 0's are exposed is to
show how much precision is known. Maxima (as far as I know) doesn't
have the concept of different real numbers to different precisions.
I would imagine a lot of these issues will go away the less we pass
through Maxima. In the meantime, using regular expressions to remove
the trailing zeros is probably you're best bet.
sage: s = latex(0.6*x); s
{0.600000000000000 x}
sage: re.sub(r'(\.[1-9]+)0+', r'\1', s)
'{0.6 x}'
- Robert
On Nov 17, 2008, at 8:19 AM, Stan Schymanski wrote:
>
> Dear Marshall,
>
> Thanks a lot for looking into this. I tried similar approaches as
> well,
> and so did the original poster. However, as soon as you introduce a
> symbolic variable into the equation, latex does weird things such as:
>
> latex(RealField(8)(0.6)*x)
> produces
> "{0.601600000000000 x}"
>
> Does this look like a bug to you, too?
>
> Cheers
> Stan
>
> Marshall Hampton wrote:
>> There are a number of interact examples on the wiki (such as the
>> Gram-
>> Schmidt one at http://wiki.sagemath.org/interact/linear_algebra) that
>> work around this problem by casting to a field of low precision, for
>> example doing something like
>>
>> latex(RealField(8)(0.6))
>>
>> produces "0.60".
>>
>> Hope that helps,
>> Marshall Hampton
>>
>>
>> On Nov 17, 9:02 am, Stan Schymanski <[EMAIL PROTECTED]> wrote:
>>
>>> A week older and still not smarter...
>>> Sorry for the noise, but I am still trying to find a way of getting
>>> useful latex output for equations that contain decimal numbers. It
>>> seems that the previous posts passed below the radars of those that
>>> might know the answer, so I am trying to push it to the surface
>>> again.
>>> Isn't anybody else bothered by rows of 0s in the latex() or show()
>>> output?
>>>
>>> Cheers
>>> Stan
>>>
>>> On Nov 10, 1:25 pm, Stan Schymanski <[EMAIL PROTECTED]> wrote:
>>>
>>>
>>>> It seems thatlatex(eqn) just evaluates eqn and prints the result
>>>> inlatexnotation, without cutting off annoying 0s or giving the
>>>> user the
>>>> opportunity to set a precision. I find this very annoying, as
>>>> suchlatexoutput is not very useful for illustration purposes.
>>>> Does anyone
>>>> know a trick how to automatically round ugly numbers for thelatex
>>>> output? I feel that this should be incorporated into thelatex()
>>>> code,
>>>> though.
>>>> Here is another illustration of the problem:
>>>>
>>>> latex(0.6*x)
>>>> {0.600000000000000 x}
>>>>
>>>> latex(0.6.n(digits=4)*x)
>>>> {0.599998500000000 x}
>>>>
>>>> The second attempt became even uglier!
>>>>
>>>> This is on sage 3.1.4 on an Intel Macbook Pro.
>>>>
>>>> Thanks for your help! (Anyone?)
>>>> Stan
>>>>
>>>
>>
>
> --
> ________________________________________
>
> Stan Schymanski
> Scientist
> Max Planck Institute for Biogeochemistry
> Postfach 10 01 64
> D-07701 Jena
>
> Phone: +49.3641.576264
> Fax: +49.3641.577274
> WWW: http://www.bgc-jena.mpg.de/~sschym
>
> Biospheric Theory and Modelling Group
> http://www.bgc-jena.mpg.de/bgc-theory/
> _________________________________________
>
>
>
> >
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to sage-support@googlegroups.com
To unsubscribe from this group, send email to [EMAIL PROTECTED]
For more options, visit this group at
http://groups.google.com/group/sage-support
URLs: http://www.sagemath.org
-~----------~----~----~----~------~----~------~--~---
