initial
First, N=(number of spatial points) * back_steps
number of points are simulated. Then, sequentially,
all spatial points for the next time instance
are simulated at once, based on the previous back_steps
instances. The distribution of the first N points
is the correct distribution, but
differs, in general, from the distribution of the sequentially
simulated variables. We prefer here to have the same distribution
all over (although only approximatively the correct one),
hence do some initial sequential steps first.
If initial
is non-negative, then initial
first steps are performed.
If initial
is negative, then
back_steps
- initial
initial steps are performed. The latter ensures that
none of the very first N variables are returned.
Default: -10
.