I am looking for a class similar to TGraph,
which would not create a private copy
of X and Y arrays but rather works on 
X,Y arrays which are provided by the user.
Such a way that I do not need to create a 
new TGraph object when (all) values in 
user's X or Y change.
(Using SetPoint(n,x,y) and Modified() and looping 
over n entries is too slow).
Or is there a faster way to tell and update TGraph 
when all values have changed?
cheers
Dirk