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ode_exampl
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Text File
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1995-05-20
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702b
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38 lines
//
// Integrate the Van der Pol equation
//
vdpol = function ( t , x )
{
local(xdot);
xdot[1;1] = x[1] * (1 - x[2]^2) - x[2];
xdot[2;1] = x[1];
return xdot;
};
vdpol_out = function ( t , x )
{
return [t; x; 2*x];
};
// system( "/usr/ucb/ps -aux | grep rlab" );
t0 = 0;
tf = 20
x0 = [0; 0.25];
tic();
// out = ode23( vdpol, t0, tf, x0, vdpol_out);
// rfile ode78
// out = ode78( vdpol, t0, tf, x0, vdpol_out );
// rfile ode4
// out = ode4( vdpol, t0, tf, x0, vdpol_out );
out = ode (vdpol, t0, tf, x0, , , , vdpol_out);
printf(" Elapsed integration time: %i\n", toc() );
plgrid ();
pltitle ( "RLaB ODE Example (vdpol)" );
xlabel ( "Time (seconds)" );
ylabel ( "States" );
plot( out );