# fisher.ode
# traveling waves in fisher's equation
#  u_t = u_xx + u(1-u)
#
# -cu' = u'' + u(1-u)
#
f(u)=u*(1-u)
u'=v
v'=-c*v-f(u)
par c=2
init u=1
@ xp=u,yp=v,xlo=-.25,xhi=1.25,ylo=-.5,yhi=.5
done