RE: how to draw (x,y.z) point without binning x and y ?

From: Olivier Couet <Olivier.Couet_at_cern.ch>
Date: Mon, 11 Jun 2007 16:02:00 +0200


Hi,  

TGraph2D is *not* binned. TH2 are. It is true that 10^7 might be big for the triangulation algorithm.
May be you should go back to TH2, use small bins and draw with option COL .   Cheers, o.Couet


From: X. Lu, Peking Univ. [mailto:hsienkuo.lu_at_gmail.com] Sent: Monday, June 11, 2007 3:52 PM
To: Olivier Couet
Cc: roottalk
Subject: Re: [ROOT] how to draw (x,y.z) point without binning x and y ?

Dear Olivier,  

Thanks ! I have just tried, but
1. my data sample is of a size of about 10^7, so TGraph2D is drawing very slowly.
2. the expected effect should be like the one in the attachment, but it seems that TGraph2D is still binning in x and y.  

Best Regards,
Xianguo  

On 6/11/07, Olivier Couet <Olivier.Couet_at_cern.ch> wrote:

        Hi,          

	I guess you should try to use TGraph2D.
	http://root.cern.ch/root/html/TGraph2D.html 
	 
	Cheers,       O.Couet
	 


________________________________
From: owner-roottalk_at_pcroot.cern.ch [mailto:
owner-roottalk_at_pcroot.cern.ch <mailto:owner-roottalk_at_pcroot.cern.ch> ] On Behalf Of X. Lu, Peking Univ.
	Sent: Monday, June 11, 2007 3:06 PM
	To: roottalk
	Subject: [ROOT] how to draw (x,y.z) point without binning x and
y ?                            

        Dear rooters,          

	I want to draw a graph for a group of 3-D data (x,y,z) in which
	the x and y values are not binned, i.e. the point in x-y plane
	is exactly a point. And moreover, the z are binned with 5 bins 
	and in  each bin  the point is displayed by a specific color.
	 
	How can I do that ?
	 
	 
	I can only think of TH2F and use SetBinContent. But the effect
	is not so satisfactory.
	 
	Thanks in advance !
	 
	Best Regards,
	Xianguo
	 

	-- 
	Take flight into the sky, beyond the moon, beyond my mind.
	
	Xianguo LU
	Physics Department, Peking University
	Beijing, China
	Tel: 0086-10-62753888(o) 




-- 
Take flight into the sky, beyond the moon, beyond my mind.

Xianguo LU
Physics Department, Peking University
Beijing, China
Tel: 0086-10-62753888(o) 
Received on Mon Jun 11 2007 - 16:02:08 CEST

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