[ROOT] SetContour

From: Caius Howcroft (howcroft@hep.phy.cam.ac.uk)
Date: Fri May 09 2003 - 10:40:15 MEST


Hi, I have been using root  3.04/02 and am having problems with 
TH2F::SetContour.

I want one contour on my plot(LnL) at z=2.3 so I do:
root [25] Double_t ilevel[1]={2.3}                                                           
root [26] LnL->SetContour(1, ilevel)
root [31] LnL->GetContour(ilevel)   
(Int_t)1
root [32] ilevel[0]              
(Double_t)2.29999999999999982e+00
root [33] LnL->Draw("cont0")
//// This produces an empty plot.
///also 
root [37] LnL->GetContour(ilevel)
(Int_t)1
root [38] ilevel[0]              
(Double_t)0.00000000000000000e+00


Drawing seems to reset the contonur levels

I also tried using several different contour levels:
Double_t ilevel[3]={0.0, 2.3, 5.0}
root [26] LnL->SetContour(3, ilevel)

I draws 3 contours at what looks like equally spaced z values.

Cheers
Caius

________________________________________
-           CAIUS HOWCROFT             -
-  +44 (0)1223 764 128      UK(office) -
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