RE: Plotting 3d (TGraph2D) data

Hi,

Can you try with 5.12 ? I have done some fixes in that area. If the problem still persist can you send a small exmaple reproducing your problem ?
I have several ideas about what "too fine" means, but I may pick the wrong one....

Cheers, Olivier

-----Original Message-----
From: owner-roottalk_at_pcroot.cern.ch
[mailto:owner-roottalk_at_pcroot.cern.ch] On Behalf Of Alexander Wagner Sent: Thursday, August 17, 2006 5:43 PM
To: Roottalk
Subject: [ROOT] Plotting 3d (TGraph2D) data

Hi!

Could it be that if I want to plot 3d data using a TGraph2D, that the grid is to fine? What I do essentially is using a csv input file looking somewhat like

   x-column y-column z-value

fill it into a TGraph2D object by some read in routine. I find that this works fine as long as the "grid" of the data is not "to fine". That is I have a grid -2000..2000 in both dimensions and I get a suitable plot if I grid it at 200, 400 and so on, but I get essentially a single centred spike at 0,0 once I use a finer grid of 50, 100, 150...

Also I find some (looks like random) spikes once I produce the plot with root compared to the same data feeded to gnuplot.

Could this be an artefact from the delauny interpolation? Or should I search for some bug in my macro? The strange thing is that it happens only if I use to fine a grid...

(Unfortunately the macros involved are not that easily cooked down to 5 essential lines...)

Root is at 5.11 on Debian GNU Linux 3.0.

-- 

Kind regards,                /                 War is Peace.
                            |            Freedom is Slavery.
Alexander Wagner            |         Ignorance is Strength.
                            |
                            | Theory     : G. Orwell, "1984"
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