File: lorenz.dem

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scilab 2.4-1
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deff('[ydot]=lorenz(t,y)',...
// Copyright INRIA
"x=y(1);...
a=[-10,10,0;28,-1,-x;0,x,-8/3];...
ydot=a*y")
deff('[j]=jacobian(t,y)',...
"x=y(1);yy=y(2);z=y(3);...
j=[-10,10,0;28-z,-1,-x;-yy,x,-8/3]")
y0=[-3;-6;12];t0=0;step=0.01;t1=10;
instants=t0:step:t1;
y=ode(y0,t0,instants,lorenz,jacobian);
xbasc(0);param3d(y(1,:),y(2,:),y(3,:))