Re: Memory Leak and TGraph slider question

Rene Brun (Rene.Brun@cern.ch)
Thu, 01 Oct 1998 11:35:10 +0200

Eddy Offermann wrote:
>
> Dear Root-ers,
>
> two questions:
>
> 1) two weeks ago, I had a question concerning cleanup of objects.
> The answer of Rene Brun seems only to solve part of the problem:
> the program does not crash anymore but we still have
> a memory leak. Below is a macro that makes a root file, followed
> by a macro that keeps on opening and closing it.
> Even when I comment out the "cd" and "tree" statements, the
> program size keeps growing.
> Maybe it is silly to be worried about an increase of 1Mb after about
> opening/closing 1000 files but if anybody could shed some light
> on this, I would appreciate it.
>

Eddy,
Thanks for reporting this problem and providing a simple test.
This was,indeed, a memory leak problem. It is now fixed
in my development version.

>
> 2) I have problems using the slider on "Tgraph" objects. Running,
> for instance, graph.C in the tutorials-directory, selecting
> with my mouse the graph, choosing DrawPanel, results in the message:
>
> root [1] Error in <TClass::GetMethod>:
> Did not find matching TMethod <GetOption> with "" for TGraph
>
> However, using the slider in the FitPanel does result in a
> different fitting region.
>
> Is there another way to zoom-in on a graph ??

The TGraph::DrawPanel function is currently not implemented.
I have added a message in the new version.
Currently there are two ways to zoom on a graph:
- via the command line by changing the pad range
- drawing a TH1F empty object (setting min and max), then
drawing the graph on top and invoking DrawPanel on the TH1F object.

Rene Brun