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

From: Olivier Couet <Olivier.Couet_at_cern.ch>
Date: Tue, 12 Jun 2007 13:13:02 +0200

Hope this will help:  

{

TCanvas *c = new TCanvas("c","Contours",600,0,600,600);

TF2 *f1 = new TF2("f2","0.1+(1-(x-2)*(x-2))*(1-(y-2)*(y-2))",1,3,1,3);

Int_t Number = 5;

Double_t Red[Number] = { 0.00, 0.09, 0.18, 0.09, 0.00 };

Double_t Green[Number] = { 0.01, 0.02, 0.39, 0.68, 0.97 };

Double_t Blue[Number] = { 0.17, 0.39, 0.62, 0.79, 0.97 };

Double_t Stops[Number] = { 0.00, 0.34, 0.61, 0.84, 1.00 };

Int_t nb=50;

TColor::CreateGradientColorTable(Number,Stops,Red,Green,Blue,nb);

f2->SetContour(nb);

f2->Draw("surf1z");

}

---

From: X. Lu, Peking Univ. [mailto:hsienkuo.lu_at_gmail.com] Sent: Tuesday, June 12, 2007 12:39 PM
To: Olivier Couet
Cc: William Robbins; roottalk
Subject: Re: [ROOT] how to draw (x,y.z) point without binning x and y ?

Thanks ! It works.  

And one more question:
I am using the option "Pcol". But how can I define the color myself?  

For example, the z value ranges from -2 to 2, then I would like to have the 4 regions
-2 ~ -1, -1 ~ 0, 0 ~ 1, 1 ~ 2
represented by 4 colors.
How can I do this?  

Thanks again !  

Best Regards,
Xianguo    

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

        TGraph2D with option P or P0 is the answer. See TGraph2D help.         

	-----Original Message-----
	From: owner-roottalk_at_pcroot.cern.ch
	[mailto:owner-roottalk_at_pcroot.cern.ch] On Behalf Of William
Robbins
	Sent: Monday, June 11, 2007 5:23 PM 
	To: X. Lu, Peking Univ.
	Cc: roottalk
	Subject: Re: [ROOT] how to draw (x,y.z) point without binning x

and y ?         

	Hi-
	I'm having a similar problem. I know that TMarkers can be used
for a
	plot of non-binned datapoints in a 2D-plane --maybe this somehow
helps 
	Xianguo-- but how can we extend to three dimensions?
	cheers
	-Billy Robbins
	
	On Jun 11, 2007, at 9:05 AM, X. Lu, Peking Univ. wrote:
	


	> 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 Tue Jun 12 2007 - 13:13:09 CEST