[Scilab-users] (no subject)

[Zeyu Liu]

actually, with bc program in Linux, I get

9151064444577189 * 17 = 155568095557812213

and obvious this precise. and with scilab, I get

-->format (25);

-->11 / 17
 ans  =

    0.6470588235294117973595

so the windows calculator is correct.


On Thu, Apr 25, 2013 at 3:49 PM, Dang, Christophe <Christophe.Dang at sidel.com
> wrote:

> Hello again
>
> De la part de Renzo Zini
> Envoyé : mercredi 24 avril 2013 15:58
>
> > with the Windows calculator the result is
> >
> > 9151064444577189,6470588235294118
>
> another point is: does the Windows calculator compute the right value?
>
> You can have a greater precision by performing two divisions:
>
> (a + b)/c = a/c + b/c
>
> each having no underflow.
>
> then :
> 55568095557812224 = 55568095557812200 + 24
>
> -->155568095557812200/17
>  ans  =
>
>     9151064444577188.
>
> -->24/17
>  ans  =
>
>     1.4117647058823530326066
>
> so we can guess that
> 55568095557812224/17 = 9151064444577189.4117647...
>
> so the Windows calculator gives a result, but it is false at the first
> decimal...
>
> Now: do you really need to have a precision of more than 16 digits?
>
> This might be the case, especially if the error propagates.
>
> In my field, I'm usually happy with 4 digits ;-)
>
> --
> Christophe Dang Ngoc Chan
> Mechanical calculation engineer
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