Problems with numerical accuracy?

[marco atzeri]

On 5/30/2012 11:08 AM, Vegard Aaker wrote:
>   Hi,
>
> I am writing a optimization algorithm that solves a quite large linear
> system of floating point numbers. The algorithm works well on a PC,
> and should be quite robust to floating point errors. But when I am
> using a microcontroller the algorithm crash, most likely due to
> numerical issues.
>
> I am using the Ethernut 5 board and Nut/Os that use newlib as the
> floating point library. Now I am wondering what kind of accuray I can
> expect from newlib compared to for example a PC (running windows)?
> Should I expect much more accuracy if the microcontroller contains a
> FPU?
>
> Kind regards
> Vegard Aaker


number of digits for your calculation on board and PC ?

On PC are you using floats or doubles ?


A windows FPU could make calculation with 64 or 80 bits.

Regards
Marco