too small values

Hi tcl guys,
I know there is mpexpr to handle too small numbers  - but I 'm working with
windows xp and I think there is no version?
Perhaps you know another application/plugin?
I have two very little values one in numerator the other in denominator -
but the quotient isn't small.
How can I solve this problem with tcl?
error message with tcl and expr: divide by zero.
Thanks in advance
Hans

Hans Herrmann wrote:
> I know there is mpexpr to handle too small numbers  - but I 'm working wit
h
> Windows XP and I think there is no version?
> Perhaps you know another application/plugin?
> I have two very little values one in numerator the other in denominator -
> but the quotient isn't small.
> How can I solve this problem with tcl?
> error message with tcl and expr: divide by zero.

You are experiencing floating point underflow?  Is that what you mean?

If you are underflowing a double-precision IEEE floating point value,
that same problem is going to present in most programming languages.

Perhaps you need to re-cast your calculations in terms of logarithms?

--
| Don Porter          Mathematical and Computational Sciences Division |
| donald.porter@nist.gov             Information Technology Laboratory |
| http://math.nist.gov/~DPorter/                                  NIST |
 |_______________________________________
_______________________________|

In article <slrncelpt7.dai.dgp@clover.cam.nist.gov>,
Don Porter  <dgp@nist.gov> wrote:
>Hans Herrmann wrote: 
>
>You are experiencing floating point underflow?  Is that what you mean?
>
>If you are underflowing a double-precision IEEE floating point value,
>that same problem is going to present in most programming languages.
>
>Perhaps you need to re-cast your calculations in terms of logarithms?

Hans Herrmann wrote:
>
> Hi tcl guys,
> I know there is mpexpr to handle too small numbers  - but I 'm working wit
h
> Windows XP and I think there is no version?
> Perhaps you know another application/plugin?
> I have two very little values one in numerator the other in denominator -
> but the quotient isn't small.
> How can I solve this problem with tcl?
> error message with tcl and expr: divide by zero.
> Thanks in advance
> Hans

If speed is not an issue, then there is the MPA package
(http://wiki.tcl.tk/10764)
It is a multiple-precision arithmetic package in pure Tcl.

Regards,

Arjen

"Arjen Markus" <arjen.markus@wldelft.nl> schrieb im Newsbeitrag
news:40EB97A2.B4001C99@wldelft.nl...
> Hans Herrmann wrote: 
with 
denominator - 
>
> If speed is not an issue, then there is the MPA package
> (http://wiki.tcl.tk/10764)
> It is a multiple-precision arithmetic package in pure Tcl.
>
> Regards,
>
> Arjen

Hi Arjen,
hi all other guys,
thanks for your help - I will test your suggestion!
Hans