Re: [ROOT] Creating a graph or histogram from raw data

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Hi John

I tried with the tutorial file basic.C but everytime when I run it it returns "
found 0 points".  I created a file called basic.dat that consists of three
columns of simply random float values but it still returns the same result.  Is
there something I am doing wrong?

Thanks

David


Quoting Frankland John <frankland@ganil.fr>:

> Hi David
> 
> Have a look at $ROOTSYS/tutorials/basic.C.
> In this example of reading numerical data from a text file, the data /are/
> in 3 columns separated by spaces - but nothing in the ROOT framework
> /requires/ this - you just have to make sure you read whatever the file is
> correctly.
> 
> Hope this helps
> John
> 
> david.hou@utoronto.ca wrote:
> 
> >Hi JOhn
> >
> >Let's say the raw data are in ascii type format.  What should be done for
> ROOT
> >to take in data from it?  How does the data must look in the ascii file
> (i.e. in
> >3 columns with spaces to separate? or..? )?
> >
> >Thanks
> >
> >David
> >
> >Quoting Frankland John <frankland@ganil.fr>:
> >
> >  
> >
> >>Hi David
> >>
> >>I'd love to help but ... can you be a /little/ bit more specific ?
> >>Is this raw data a text (ascii) file ? A HBOOK ntuple ? A site-specific 
> >>data acquisition file ?
> >>Hastily-scribbled figures on small pieces of notepaper soaked in coffee ?
> >>
> >>Best wishes
> >>John Frankland
> >>
> >>david.hou@utoronto.ca wrote:
> >>
> >>    
> >>
> >>>Hi there, I am recently starting to use ROOT and I wish to jump into
> some
> >>>matters right away.  I have a very simple question:  what do I have to
> do
> >>>      
> >>>
> >>in
> >>    
> >>
> >>>order to get a file consisting of raw data to be an input for ROOT for
> >>>      
> >>>
> >>plotting
> >>    
> >>
> >>>either a graph or a histogram?
> >>>
> >>>Thanks for the help!
> >>>
> >>>David
> >>> 
> >>>
> >>>      
> >>>
> >>-- 
> >>John D. Frankland
> >>Beam Coordinator
> >>GANIL
> >>B.P. 55027
> >>14076 CAEN Cedex 05
> >>
> >>tel: +33 (0)231454628
> >>fax: +33 (0)231454665
> >>
> >>
> >>
> >>    
> >>
> >
> >
> >  
> >
> 
> 
> -- 
> John D. Frankland
> Beam Coordinator
> GANIL
> B.P. 55027
> 14076 CAEN Cedex 05
> 
> tel: +33 (0)231454628
> fax: +33 (0)231454665
> 
> 
> 

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