Cannot Understand th2f

ROOT
1

Hi everybody,
I’m using the last version of root 5.14 compiled for macosx 10.4.
Im running this Macro : TH2FProblem.C
I don’t understand its video output.
In theory I attend to have an histogram with some markers on the screen
covered perfectly by red ones, but it seems not!
What i see is that red points,even if are made by the same values,are differently printed on the screen.
Where is my fault?
TH2Fproblem.C (882 Bytes)

2

The option SCAT (default option when you plot a TH2F) draws random points in each cell. The number of points is proportional to the cell content. The result is some grey effect. The darker a region is the higher the cell content is. The position of the points themselves has no meaning. To avoid this, use others options like BOX or COL or CONT etc … see:
root.cern.ch/root/html/THistPain … nter:Paint

3

Thanks a lot

4

Hi,
I wonder if there is a way to make the COL option default (instead of SCAT) for h->Draw() or ttree->Draw() for 2D histograms? I was not able to find any trick for .rootrc nor for rootlogon.
thanks
jaromir

5

No, this is not possible. This only way is in TBrowser but that does not apply on commands in macros.