Re: [Scilab-users] Strange behaviour of prod on rationals

2020-03-17 Thread Federico Miyara
Pierre, Thanks for your answer. However, I believe no involved computatins are required to get the correct result. The multiplication of the two polynomials from the denominators is straightforward, no need to solve any system, no risk of ill-conditioned or badly-scaled matrices. This must

Re: [Scilab-users] ?==?utf-8?q? Bug report etiquette : memory leaks in graphics

2020-03-17 Thread Antoine Monmayrant
Hello, Following a private discussion with Samuel, I submitted a bug report on a memory leak in Matplot(): http://bugzilla.scilab.org/show_bug.cgi?id=16377 Cheers, Antoine Le Mardi, Mars 17, 2020 15:28 CET, "Antoine Monmayrant" a écrit: > Hi all, > > I know that it's usually bad prac

[Scilab-users] Bug report etiquette : memory leaks in graphics

2020-03-17 Thread Antoine Monmayrant
Hi all, I know that it's usually bad practice to duplicate an already existing bug. But it's also good practice to make one report per specific bug. I've just waisted two days on a nasty memory leak when plotting/clearing a graph in a loop (50 iterations were enough to kill scilab). Looking at re

Re: [Scilab-users] Strange behaviour of prod on rationals

2020-03-17 Thread Perrichon
Here are examples of my process in Open loop (FTBO) or Close loop (FTBF) Depending of managemat, D can have s14 … De : Perrichon Envoyé : mardi 17 mars 2020 10:49 À : 'Users mailing list for Scilab' Objet : RE: [Scilab-users] Strange behaviour of prod on rationals Hello Federico

Re: [Scilab-users] Strange behaviour of prod on rationals

2020-03-17 Thread Perrichon
Hello Federico I have met few months or years ago this problem when i was developping my « OPTSIM Solution » software to fix parameters of a PID for turbines (30 mw to 2 gw) in Nyquist and Bode Plans with hydraulic parameters site So I’ve seen instability of the denominator, witch damage ca

[Scilab-users] Strange behaviour of prod on rationals

2020-03-17 Thread Federico Miyara
Dear all, Look at this code (the coefficients are actually the result of pevious calculations): NUM = [5.858D-09 + 2.011D-08*%s + 4.884D-08*%s^2 ... 5.858D-09 + 8.796D-10*%s + 7.028D-10*%s^2] DEN = [0.1199597 + 7.2765093*%s + %s^2 ...    8.336136 + 7.0282601*%s + %s^2] q = NUM./DEN Runni