RE: ] Y-axis set

Hi,

You probably want to define the binning of your histograms, by doing:

tup->Draw("y:x>>h1(100,0,10,100,0,10)")
tup->Draw("yp:x>>h2(100,0,10,100,0,10)","","same")

The syntax is >>hname(nbinsx,xmin,xmax,nbinsy,ymin,ymax).

This is explained in detail both in the reference guide (http://root.cern.ch/root/html/TTree.html#TTree:Draw) and in the user's guide, p. 224 (ftp://root.cern.ch/root/doc/12Trees.pdf).

Regards,
Michele.

> -----Original Message-----
> From: owner-roottalk_at_root.cern.ch [mailto:owner-roottalk_at_root.cern.ch]
> On Behalf Of Arthur E. Snyder
> Sent: Tuesday, June 16, 2009 2:08 AM
> To: Rene Brun
> Cc: roottalk_at_lxbuild091.cern.ch
> Subject: [ROOT]] Y-axis set
>
>
>
>
> Hi Root Folks,
>
> A stupid question I know .. but how to I set max and min Y range when
> making
> a simple scatter plot?
>
> I do
>
> tup->Draw(y:x)
>
> and I'd like to set y range such that when I do
>
> tup->Draw(yp:x,"","same")
>
> I can fit yp on the same plot.
>
> I've looked at trying to manuplate Y-axis of htemp, but can't find
> what I
> need. It must be easy but I'm just not finding it ...
>
> -Art S.
>
> PS. Sorry about previous message with stale subject line ...
>
>
>
>
>
> > A.E. Snyder, Group EC \!c*p?/
> > SLAC Mail Stop #95 ((. .))
> > Box 4349 |
> > Stanford, Ca, USA, 94309 '\|/`
> > e-mail:snyder_at_slac.stanford.edu o
> > phone:650-926-2701 _
> > http://www.slac.stanford.edu/~snyder BaBar
> > FAX:650-926-2657 Collaboration
> >
> >
> >
> > On Mon, 2 Mar 2009, Rene Brun wrote:
> >
> >> Art,
> >>
> >> Your analysis is right.
> >>
> >> Rene Brun
> >>
> >> Arthur E. Snyder wrote:
> >>> Thanks, Rene. Something similar must be happening with our slightly
> more
> >>> complex fit where sometimes gMinuit apprears and other times not.
> >>>
> >>> I would guess that if we move the fitting function to pre-defined
> function
> >>> rather then a string in the TF1 function this would fix the
> "problem" as
> >>> root would no longer be able to see if the function was simple or
> not and
> >>> would always have to use Minuit.
> >>>
> >>> Does that sound right?
> >>>
> >>> -Art
> >>>
> >>> A.E. Snyder, Group EC \!c*p?/
> >>> SLAC Mail Stop #95 ((. .))
> >>> Box 4349 |
> >>> Stanford, Ca, USA, 94309 '\|/`
> >>> e-mail:snyder_at_slac.stanford.edu o
> >>> phone:650-926-2701 _
> >>> http://www.slac.stanford.edu/~snyder BaBar
> >>> FAX:650-926-2657 Collaboration
> >>>
> >>>
> >>>
> >>> On Sat, 28 Feb 2009, Rene Brun wrote:
> >>>
> >>>> Art,
> >>>>
> >>>> When fitting with simple functions like polynomials, TMinuit is
> not used,
> >>>> only the linear fitter (TLinearFitter). The linear fitter is much
> faster
> >>>> than Minuit. You can force fitting of a polynomial with Minuit by
> >>>> specifying the fit option "L", see documentation of TH1::Fit
> >>>>
> >>>> Rene Brun
> >>>>
> >>>> Arthur E. Snyder wrote:
> >>>>>
> >>>>> Rene et al.,
> >>>>>
> >>>>> We are seeing strange behavior with gMinuit. It seems to come and
> go. I
> >>>>> expect it to be there after I do it fit.
> >>>>>
> >>>>> An example:
> >>>>>
> >>>>> I have a histogram (it doesn't matter what it is).
> >>>>>
> >>>>> root [26] h->Fit("pol4")
> >>>>> Fitting results:
> >>>>> Parameters:
> >>>>> NO. VALUE ERROR
> >>>>> 0 2.625170e+03 1.191186e+02
> >>>>> 1 -1.565262e+04 1.055977e+03
> >>>>> 2 3.861477e+04 3.327115e+03
> >>>>> 3 -4.315887e+04 4.446220e+03
> >>>>> 4 1.804345e+04 2.140152e+03
> >>>>> (Int_t)0
> >>>>> root [27] gMinuit
> >>>>> (class TMinuit*)0x0
> >>>>> root [28]
> >>>>>
> >>>>> -->gMinuit is MIA
> >>>>>
> >>>>> root [28] h->Fit("gaus")
> >>>>> FCN=687.968 FROM MIGRAD STATUS=CONVERGED 3927 CALLS
> 3928
> >>>>> TOTAL
> >>>>> EDM=5.19353e-06 STRATEGY= 1 ERR
> MATRIX NOT
> >>>>> POS-DEF
> >>>>> EXT PARAMETER APPROXIMATE STEP
> FIRST
> >>>>> NO. NAME VALUE ERROR SIZE
> DERIVATIVE
> >>>>> 1 Constant 1.93812e+09 1.54608e+08 9.24169e+02
> 2.24749e-10
> >>>>> 2 Mean -8.98813e+00 2.37909e-02 2.18708e-05
> 1.46725e+00
> >>>>> 3 Sigma 1.67356e+00 3.02321e-02 2.53915e-03** at
> limit **
> >>>>> (Int_t)0
> >>>>> root [29] gMinuit
> >>>>> (class TMinuit*)0x9486650
> >>>>>
> >>>>> -->gMinuit is there!
> >>>>>
> >>>>> In a more complex sitution where we construct a simple TF1 in a
> macro,
> >>>>> gMinuit is sometimes there and sometimes not -- seemingly w/o
> reason --
> >>>>>
> >>>>> -Art S.
> >>>>>
> >>>>>
> >>>>>
> >>>>> A.E. Snyder, Group EC \!c*p?/
> >>>>> SLAC Mail Stop #95 ((. .))
> >>>>> Box 4349 |
> >>>>> Stanford, Ca, USA, 94309 '\|/`
> >>>>> e-mail:snyder_at_slac.stanford.edu o
> >>>>> phone:650-926-2701 _
> >>>>> http://www.slac.stanford.edu/~snyder BaBar
> >>>>> FAX:650-926-2657 Collaboration
> >>>>>
> >>>>>
> >>>>>
> >>>>
> >>>>
> >>>
> >>
> >>
> >
> >
Received on Tue Jun 16 2009 - 10:02:15 CEST