sorry, ignore the previous finding, turn out to be it seems like just a display
issue.
However, I think my initial thought of the precision might be the issue? some
number are too small (first case) and giving error during computation?
thx
rgds,
CL
---- On Mon, 09 Mar 2020 22:11:43 +0800 Chin Luh Tan
<chinluh....@bytecode-asia.com> wrote ----
initially I thought could it be possible the number is too small (or too large)
to be handled by double?
after trying scaling down the problem, I notice that in Scilab 6.0.2 onwards:
--> 2e-20*%i
ans =
0.
in Scilab 5.5.2
-->2e-20*%i
ans =
2.000D-20i
Could this be the issue?
thanks.
rgds,
CL
---- On Mon, 09 Mar 2020 21:04:12 +0800 Stéphane Mottelet
<mailto:stephane.motte...@utc.fr> wrote ----
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Maybe an inversion made in state-space could me more reliable ?
S.
Le 09/03/2020 à 13:36, mailto:sgoug...@free.fr a écrit :
> Hello Federico,
>
> cond() and rcond() do not accept rationals, but the determinant of A is very
> close to 0:
> --> det(A)
> ans =
>
> 3.573D-10
> ------------------------
> 0.0000027s² +7.433D-10s³
>
> This likely explains that the inversion is not reliable.
>
> Regards
> Samuel
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--
Stéphane Mottelet
Ingénieur de recherche
EA 4297 Transformations Intégrées de la Matière Renouvelable
Département Génie des Procédés Industriels
Sorbonne Universités - Université de Technologie de Compiègne
CS 60319, 60203 Compiègne cedex
Tel : +33(0)344234688
http://www.utc.fr/~mottelet
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