Re: [ROOT] Missing value support in plots

From: Eddy Offermann (eddy@rentec.com)
Date: Wed Apr 11 2001 - 20:58:48 MEST


Hi,
In analysis of financial data it is crucial to have that concept.
(for instance what to have in a time-series for the closing price on a
 holiday...). However, I do not see the need to make ROOT do something
 special here. In the case of a time series , I fill the array to setup
 up the hist or graph while skipping the "missing values". We have
 of course a special number for the "missing values" so they are easy to
 recognize.
 
 Graphing the data is only half the story. All the operations on time series
 need to know what to do if you have a missing data point
 
 my 0.02
> 
> Hello Root Developers,
> 
> I don't know if "missing value" support in displaying histogram and graph 
> plots has already been added to the wish list ? Does anybody else miss this 
> feature ?
> 
> It's one of the features that I really like in IDL and am currently sorely 
> missing in my ROOT analysis. It consists basically in the the ability to 
> designate certain values as "missing" or "bad" data and have the 
> contour/plot routines ignore this data when building up the 
> image/contour/plot.
> 
> Continue the good work.
> 
> Malcolm
> 
> <>------------------------------------------------<>
> Malcolm W. J. Davidson
> CESBIO - UMR 5639 CNES-CNRS-UPS
> 18 Avenue Edouard Belin
> BP 2801
> F-31401 Toulouse Cedex 4  France
> e-mail : davidson@cesbio.cnes.fr
> phone (33)(0)5.61.55.85.84
> fax   (33)(0)5.61.55.85.00
> <>------------------------------------------------<>
> 

Eddy A.J.M. Offermann
Renaissance Technologies Corp.
Route 25A, East Setauket NY 11733
e-mail: eddy@rentec.com
http://www.rentec.com



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