sven schagen wrote:
>
> Dear All,
>
> In my datafile (a converted hbook file) I have the coordinates of
> conversion point in an event. I would like to plot these in order to see
> what dead material is there (of course I know this, but just to check
> the data).
> The most simple option to do this is, of course, a simple Draw
> statement.
> Something like:
>
> TFile f = new TFile("./other/dis96_06.root");
> h1.Draw("y_conv:x_conv","conditions blah");
>
> However, I then get a plot in which the axes run from -80 to 80, for
> both the x and the y axis.
> I would like a detailed plot of the range -40 to 40, also both on the x
> and y axis.
> I found a type on how to do this, however, this doesn't seem to work.
> Can anybody please tell me how I should do this.
>
You can specify teh boundaries of teh histogram used by h1.Draw.
For example:
TH2F *h2 = new TH2F("h2","blabla",80,-40,40,80,-40,40);
h1.Draw("Y:x>>h2","conditions")
For more details, see URL:
http://root.cern.ch/root/HowtoReadTree.html
Rene Brun
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