recur(1)

NAME
recur - a bilinear recurrent equation

CALLING SEQUENCE
[y]=recur(x0,var,k,n)
[integr]=logr(k,var)

DESCRIPTION
computes solutions of a bilinear recurrent equation
x(i+1)=-x(i)*(k + sqrt(var)*br(i))
with initial value x0 and driven by a white noise of variance var. Trajectories are drawn and the empirical Lyapunov exponant is returned ( x(i) is not to much different from exp(y*i) ) A theorical computation of the Lyapunov exponant is given by
[integr]=logr(k,var)