[ROOT] colz

From: Aldo F. Saavedra (AFSaavedra@lbl.gov)
Date: Wed Sep 04 2002 - 01:29:15 MEST


Hi,

I find that drawing 2d histograms with the colz option
represents data in a much clear manner. It colours
the area corresponding to the bin rather than creating
the a contour as in the cont option. I think the former
works better with histograms with a small number of
bins as in the case of my data.

My only problem is that the colz option, the colours
of the cell is proportional to the value of the cell.
I was wondering if it would be possible to set
the levels manually as in SetContour() .

The other wish is to do with the palette that is
drawn with the z option. At the moment the z length
of the rectangle drawn for the particular colour
is proportional to the distance between the two
levels. So if I have levels 0.1,0.2,1,3,4,50,200
the palette is pretty much covered by the last
two levels. I think it would be beneficial if
all the colours occupied the same area and each
level gets a major tick, it would
make matching a value to the colour or contour
2d map much easier.

Cheers,
Aldo



***********************************************************
 Aldo F. Saavedra
 ATLAS Collaboration - Pixel Group (Physics Division)
 Lawrence Berkeley National Laboratory

 Email:          AFSaavedra@lbl.gov
 Phone:          1 510 486 4690
 Fax:		 1 510 486 5101
 Postal Address: Lawrence Berkeley National Laboratory
                 1 Cyclotron Rd Mailstop 50B-6208
                 Berkeley, CA 94720
                 USA



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