Re: handling a large amount of data with trees

Chiara,

A few months ago, I already explained you how to proceed with a Tree. If your requirement has not changed, see my previous mail at that time. if your requirement has changed, send me a private mail explaining the new situation.

Rene Brun

Chiara Zampolli wrote:
> Dear all,
>
> I am trying to handle a large amount of data using trees. What I
> should store is 1 integer and 5 floats ~150 times per each channel out
> of 160000.
> The simplest way to proceed seemed to be creating a tree with 6
> branches for the 6 variables (1 int + 5 floats), and then to fill it
> 150*160000 times. But then, when trying to write on a file this tree,
> the memory required is too big, and AliRoot (I have to use AliRoot)
> crashes - even if in case I use root it doesn't. I have tried also
> with only one branch and 6 leaves, but nothing changes.
> Probably this is not the most convenient approach to exploit the
> functionalities of trees... Do you have any suggestions that could
> help me?
>
> Thanks a lot for your help.
> Best Regards,
> Chiara
Received on Tue Mar 06 2007 - 19:05:33 CET