Dear Root Experts,
I am having trouble with a simple, 1 branch TTree. Since the problem
doesn't occur for smaller TTrees (less than 5-10 Mb), the debugging loop
is very slow.
So, my first and main question is, is there a way to check the sanity
of a tree, beyond TTree::Print()?
My second question is, does the odd behavior described below ring
a bell with anyone? Is there something about how TTree::Draw() gets
variable ranges for 2-D plots that offers a clue to what I might be
doing wrong?
I write the tree to a file, close the file, and open it in a
completely new session, which knows nothing of the macro I used to create
and fill the tree. TTree::Print() looks fine. 1-D plots are fine, with
or without cuts on other variables. TTree::Scan() is also fine.
When I try to do a 2-D plot, however, axes are drawn almost
immediately, with too small a range for one of the variables, in at
least one case. (That case involves a variable that is monotonic in
entry number). The memory usage of the root process goes to 3 times the
normal level, and it takes much, much longer to draw than a 1-D plot.
Any ideas? Many Thanks,
Peter Shanahan
=======================================================================
Fermilab MS-220 Phone: (+1) 630 840 8378
P.O. Box 500 Fax: (+1) 630 840 6039
Batavia, IL 60510 USA
This archive was generated by hypermail 2b29 : Sat Jan 04 2003 - 23:51:04 MET