Warning, the name changecoords has been redefined
Execute the first and next line once.
Each time the next group is executed (by placing the cursor and hitting enter) you
will get a path-graph for a simple symmetric random walk of length 1000. You can change
the length of the walk in the obvious way.
> L:=:S:=0:for i from 1 to 1000 do S:=S+2*x()-1: L:=[op(L),S]: od: