Question: Plotting points

Dear All, I'm trying to plot points generated by something called the logistic map by using the following code:

> L:=array(1..30,1..1);
   x:=0.3;
   for i from 1 to 30 do
   x:=4*x*(1-x);
   L[i,1]:=x
   od;
   print(L);
 

>Lpoints:=convert(L,listlist);
>plots[pointplot](Lpoints,symbol=point);

But what I get is an error message saying "Error, (in plots/pointplot) incorrect 1st argument."  Any suggestions as to how to overcome this problem? 

Also,with regard to the array that is generated: the initial condition, x=0.3, does not appear in the array.The first entry in the array is 0.84,which is the first iterate of the initial condition.Any suggestions as to how I can get the initial condition to be the first entry?

Thanks for any suggestions!

Isabelle