Wolfgang Korsch wrote:
>
> Hi,
>
> I have two questions:
>
> a) It happens quite often that the "ntuple->Draw("abc");"
> command does not use the full range of the histogram.
> The maximum x-values displayed is not the real
> maximum x-value.
> I do have to predefine a 1d-hist and specify the scale
> to get the full range.
> Is there a way to get the ntuple->Draw command to
> autoscale properly?
>
In version 1.00 I have optimized the computation of the histogram
limits (both quality and time). The estimation of the limits is made
on the first fEstimate events (default in version 0.9) was 1000.
In version 1.00, it is 10000 and this parameter may be changed
by tree->SetEstimate(nevents).
> b) I essentially seem to have the same problem for
> profile plots. It happens often that the
> command "ntuple->Draw("y:x>>hprof","","prof");"
> does not use the full x-range (seems to be the same
> cut-off as in a)). The additional problem here is that
> predefining a profile hist using
> "hprof1 = new TProfile("hprof1","y vs x",nch,xmin,xmax,ymin,ymax);"
> doesn't help, since the "ntuple->Draw("y:x>>hprof1,"","prof");"
> command overwrites the previous definition autoscales, so
> I am back to the original problem.
> How can I fix this?
>
I do not understand this last point. If you specify >>hprof,
the limits are the ones in the original hprof.
Rene Brun
This archive was generated by hypermail 2b29 : Tue Jan 04 2000 - 00:26:18 MET