TProfile2D: contours at z=0

ROOT
1

Hello,

The attached plot shows the results of
TProfile2D::Draw(“contz”);

The colors around a z-value of 0 are not drawn correctly. They are white instead of the green that I would expect (and want!) from the palette on the right side. The bin-count for bins at z=0 is larger than 0, i.e. they are filled. So, they should be a green color and not the white, which I think means “empty bin”. I have also attached a 3-d view of the TProfile (surf2z) for better illustration. (This appears first in the post, eventhough I added it last…)

Thanks for your help.

Martin


Picture 1.png778×546 11 KB

2

Could you post your canvas.root file instead of the png file, such that it will be easy to figure out what you mean?

Rene

3

Hi Rene,
here is the fCanvas1.root file.

Thank you,
Martin
fCanvas1.root (27.9 KB)

4

Use:
TProfile2D::Draw(“cont4z”);
CONT4 uses the same algorithm as the 3D surfaces drawing.
CONT does not paint the empty bins.

5

Cont4z and surf2z produce a flat surface at z=0. I don’t want this for bins that are empty. The z-value in my TProfile2D goes through 0, but not all bins at z=0 are filled. From the cont4 and surf2 it is impossible to tell wether the z-value is 0 or wether the bin are empty.

So, I want to suppress empty bins in a contour plot for TProfile2D. Is this possible?

Thanks!
MS

6

Seems to me you asked exactly the opposite in your first message:

So if you want the bins containing 0 being white use option the CONT. If you want them green use option CONT4.

NOTE: There is no way to make the difference between an empty bin (never touched by Fill() ) and a bin which is 0 because the sum of all the Fill() is 0.

7

<== This was what I wanted. I have a hard time expressing myself clearly. :: So, I have a feature request, then? Should I submit it separately to the feature request mailing list?

Regards,
M S

8

Yes, that is not a drawing matter.