File: d1p17.code

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scilab 2.4-1
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deff('[ydot]=f(t,y)','ydot=[a-y(2)*y(2) -1;1 0]*y')
a=1;y0=[1;0];t0=0;instants=0:0.02:20;
y=ode(y0,t0,instants,f);
plot2d(y(1,:)',y(2,:)',[-1],'011',' ',[-3,-3,3,3],[10,2,10,2])
xtitle('Van der Pol')