Hello,
Le 22/04/2019 à 14:48, Richard a écrit :
Hello - using scilab 6.0.2 on windows 7 pro;
I'm pretty much a newbie here, but somewhat familiar with differential
equations.
However, I cannot find a way to get a matrix (NOT a VECTOR!) output
from the scilab 'ode' function. No matter what, all it gives is a row
vector.
Example code (nonlinear Rossler equations):
function [ydot]=rdv(t,y)
ydot(1) = -(y(2) + y(3))
ydot(2) = y(1) + 0.2*y(2)
ydot(3) = 0.2 + y(3)*(y(1) - 5.7)
endfunction
t=0:0.05:50;
t0=0;y0=[-1.0,0.0,0.0];
y=ode(y0,t0,t,list(rdv,a,b,c));
param3d(y(1),y(2),y(3))
y0 = [-1.0,0.0,0.0]';
y = ode(y0,t0,t,rdv);
param3d(y(1,:),y(2,:),y(3,:)) works: But the fact that y and t must be
of "orthogonal shapes" is not clearly indicated or highlighted in the
ode() help page. This clearly misses. There are some (rather unclear)
explanation for y being even a matrix ! but for simpler multivariable
cases, nothing. We should improve the page.
Anyway, writting param3d(y(1),y(2),y(3)) plots only one point. HTH Samuel
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