Dear Rene,
Here is what I am doing:
1) create a 1D profile histgram (TProfile) to see the correlation between
variables x and y.
2) fill the profile with x and y of an event (inside event loop)
3) the result profile histogram is fitted with "pol1" (errors are set)
4) save "pol1" into a file (function is saved with error)
5) open the file and access the function by
TF1 *pol1=(TF1*)file.Get("pol1")
6) draw by pol1->Draw("e") <-- I'm hoping it pass the option "e" to
TH1::Draw().
I found that there is no option "e" in TF1::Draw(). My guess is that it
create/fill a histogram, but not set the error. Am I right?
Regards,
Inkyu
On Wed, 14 Nov 2001, Rene Brun wrote:
> Hi Inkyu,
>
> What is your algorithm to compute the errors on the function ?
>
> Rene Brun
>
> On Wed, 14 Nov 2001 icpark@mail.cern.ch wrote:
>
> > Dear Rooters,
> >
> > Could somebody let me know how to draw a function (pol1 for example) with
> > error bar?
> >
> > Suppose we get a function "pol1" by fitting from a histogram. If I try
> > with TF1::Draw("e"), "e" is just my guess to plot error bars, it gives a
> > correct center line, but error bars are not the one from fit parameter.
> >
> > Ciao,
> > Inkyu
> >
> >
>
>
This archive was generated by hypermail 2b29 : Tue Jan 01 2002 - 17:51:08 MET