Otto Schaile is reminding me that TH2::ProjectionX,Y is able to draw the projection if the option "d" is specified. Thanks Otto Rene Brun Rene Brun wrote: > > Mikael, > > The item "ProjectionX" in the TH2 context menu makes a projection, > but does not draw it. If you have a TBrowser open, you can click on the > generated histogram named "hhh_px" if "hhh" is the name of your TH2. > Otherwise from the command line, do: > hhh->ProjectionX()->Draw(); > > Rene Brun > > Mikael Bonnier wrote: > > > > Hi, I'm new to this list. > > > > I'm using ROOT 3.05/05 on Linux RH9. > > > > I have a problem getting ProjectionX and ProjectionY to > > work. I have a TCanvas containing a 2D-histogram (TH2F) > > that is containing some 200000 events. There are > > about 400 by 400 bins and the data is [0,2500] by [0,2500]. > > When I right-click and choose ProjectionX and enter d as > > option I get a new histogram but it's empty, even though the > > 2D-histogram contains a lot of data. As I understand it, > > ProjectionX kind of should drop all dots onto the x-axis, > > or have I misunderstood something? Anyway, this is what I > > want to do. > > > > Regards, > > // Mikael Bonnier > > // Webb: http://www.df.lth.se/~mikaelb/ > > // E-post: mikaelb@df.lth.se > > // ICQ # 114635318 > > // Mob/SMS: 0701-40 76 89 > > // Tel/Fax: 046-32 32 08 > > // Exjobb: 046-222 76 34
This archive was generated by hypermail 2b29 : Thu Jan 01 2004 - 17:50:15 MET