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  • Committer: Bazaar Package Importer
  • Author(s): Torsten Werner
  • Date: 2002-03-21 16:57:43 UTC
  • Revision ID: james.westby@ubuntu.com-20020321165743-e9mv12c1tb1plztg
Tags: upstream-2.6
Import upstream version 2.6

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demos/ode/ode4.dem
 
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mode(-1)
 
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xbasc();
 
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titlepage('lorenz ode ');
 
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mode(1)
 
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// ODE definition
 
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deff('[ydot]=lorenz(t,y)',[
 
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    'x=y(1);'
 
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    'a=[-10,10,0;28,-1,-x;0,x,-8/3];'
 
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    'ydot=a*y'])
 
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deff('[j]=jacobian(t,y)',[
 
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    'x=y(1);yy=y(2);z=y(3);'
 
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    'j=[-10,10,0;28-z,-1,-x;-yy,x,-8/3]'])
 
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// Integration
 
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y0=[-3;-6;12];t0=0;step=0.01;t1=10;
 
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instants=t0:step:t1;
 
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y=ode(y0,t0,instants,lorenz,jacobian);
 
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//Visualization
 
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param3d(y(1,:),y(2,:),y(3,:))