Hi Peter, Could you put your file in some public area/web server and let me know the address as well as the TTree::Draw command that shows this problem? Which version of Root are you using? Rene Brun On Fri, 16 Aug 2002, Peter Shanahan wrote: > 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 > >
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