<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta content="text/html;charset=UTF-8" http-equiv="Content-Type"></head><body ><div style="font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 10pt;"><div>sorry, ignore the previous finding, turn out to be it seems like just a display issue. <br></div><div><br></div><div>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?<br></div><div><br></div><div>thx<br></div><div><br></div><div>rgds,<br></div><div>CL</div><br><div data-zbluepencil-ignore="true" style="" class="zmail_extra"><br><div id="Zm-_Id_-Sgn1">---- On Mon, 09 Mar 2020 22:11:43 +0800 <b>Chin Luh Tan <chinluh.tan@bytecode-asia.com></b> wrote ----<br></div><br><blockquote style="border-left: 1px solid rgb(204, 204, 204); padding-left: 6px; margin: 0px 0px 0px 5px;"><div><div style="font-family: Verdana, Arial, Helvetica, sans-serif;font-size: 10.0pt;"><div>initially I thought could it be possible the number is too small (or too large) to be handled by double? <br></div><div><br></div><div>after trying scaling down the problem, I notice that in Scilab 6.0.2 onwards:<br></div><div><br></div><div>--> 2e-20*%i <br></div><div>ans =<br></div><div><br></div><div> 0. <br></div><div><br></div><div>in Scilab 5.5.2<br></div><div><br></div><div>-->2e-20*%i <br></div><div>ans =<br></div><div><br></div><div> 2.000D-20i <br></div><div><br></div><div><br></div><div>Could this be the issue?<br></div><div><br></div><div>thanks.<br></div><div><br></div><div>rgds,<br></div><div>CL<br></div><div class="x_1109978037zmail_extra"><div><br></div><div>---- On Mon, 09 Mar 2020 21:04:12 +0800 <b>Stéphane Mottelet <<a target="_blank" href="mailto:stephane.mottelet@utc.fr">stephane.mottelet@utc.fr</a>></b> wrote ----<br></div><div><br></div><div><br></div></div><div><br></div></div><br></div>_______________________________________________ <br>users mailing list <br>users@lists.scilab.org <br>http://lists.scilab.org/mailman/listinfo/users <br><blockquote style="border-left: 1.0px solid rgb(204,204,204);padding-left: 6.0px;margin: 0.0px 0.0px 0.0px 5.0px;"><div>Maybe an inversion made in state-space could me more reliable ?<br><br>S.<br><br>Le 09/03/2020 à 13:36, <a href="mailto:sgougeon@free.fr" target="_blank">sgougeon@free.fr</a> a écrit :<br>> Hello Federico,<br>><br>> cond() and rcond() do not accept rationals, but the determinant of A is very close to 0:<br>> --> det(A)<br>> ans =<br>> <br>> 3.573D-10<br>> ------------------------<br>> 0.0000027s² +7.433D-10s³<br>><br>> This likely explains that the inversion is not reliable.<br>><br>> Regards<br>> Samuel<br>> _______________________________________________<br>> users mailing list<br>> <a href="mailto:users@lists.scilab.org" target="_blank">users@lists.scilab.org</a><br>> <a href="https://antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/lists.scilab.org/mailman/listinfo/users" target="_blank">https://antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/lists.scilab.org/mailman/listinfo/users</a><br><br>-- <br>Stéphane Mottelet<br>Ingénieur de recherche<br>EA 4297 Transformations Intégrées de la Matière Renouvelable<br>Département Génie des Procédés Industriels<br>Sorbonne Universités - Université de Technologie de Compiègne<br>CS 60319, 60203 Compiègne cedex<br>Tel : +33(0)344234688<br><a href="http://www.utc.fr/~mottelet" target="_blank">http://www.utc.fr/~mottelet</a><br><br>_______________________________________________<br>users mailing list<br><a href="mailto:users@lists.scilab.org" target="_blank">users@lists.scilab.org</a><br><a href="http://lists.scilab.org/mailman/listinfo/users" target="_blank">http://lists.scilab.org/mailman/listinfo/users</a><br></div></blockquote></blockquote></div><div><br></div></div><br></body></html>