# How to use XPP to produce a phase-plane diagram # Species competition equations x'=r1*x*(1-a*x-y) y'=r2*y*(K-b*y-x) par r1=1,r2=1,a=0.3,b=2,K=3 @ xp=x,yp=y,xlo=0,xhi=6,ylo=0,yhi=3 done