#  these are not the correct right-hand sides
# you should put the ones that you derive here
x'=x*(.5-y)
y'=-.5*y+x*y
par d=.75
@ xlo=-.05,ylo=-.05,xhi=1.1,yhi=1.1
@ xp=x,yp=y
@ nmesh=100
@ total=200
d