RE: [ROOT] How can I choose the accuracy of numbers ?

From: Valeri Fine (fine@bnl.gov)
Date: Wed May 26 2004 - 20:08:38 MEST 

Check "Using printf() for Output in C Programs (PDF)"

http://www.wvutech.edu/mclark/CS%20Eng%20I/Using%20printf2.pdf


----
Best regards
                   Valeri


> -----Original Message-----
> From: owner-roottalk@pcroot.cern.ch
[mailto:owner-roottalk@pcroot.cern.ch] On
> Behalf Of Valeri Fine
> Sent: Wednesday, May 26, 2004 1:32 PM
> To: 'Luis March Ruiz'; roottalk@pcroot.cern.ch
> Subject: RE: [ROOT] How can I choose the accuracy of numbers ?
> 
> See (for example or any other C/C++ book Web site )
> 
> http://www.lysator.liu.se/c/bwk-tutor.html#simple-io
> "  . . .
> printf will format floating point numbers: ``%w.df'' in the format
> string will print the corresponding variable in a field w digits wide,
> with d decimal places.  An e instead of an f will produce exponential
> notation.
>  . . . "
> 
> ----
> Best regards
>                    Valeri
> 
> 
> > -----Original Message-----
> > From: owner-roottalk@pcroot.cern.ch
> [mailto:owner-roottalk@pcroot.cern.ch] On
> > Behalf Of Luis March Ruiz
> > Sent: Wednesday, May 26, 2004 1:07 PM
> > To: roottalk@pcroot.cern.ch
> > Subject: [ROOT] How can I choose the accuracy of numbers ?
> >
> >
> >   Dear ROOT users,
> >
> >   I copy some results to a txt file (it goes OK),
> >
> >   fprintf(foutput," %s    %g     %g      %g       %g      %g \n",
> > histo,p0[i],e0[i],Chi2_offset,Chi_2/(n_bin*1.0-1.0),Kolmog_comp[i]);
> >
> >   All these numbers are declared as Double_t.
> >
> >   my problem is:
> >
> >   How can I choose the accuracy of numbers ?
> >
> >   I would like to put them in columns with the same width (i.e. with
> the
> > same number of digits for all numbers).
> >
> >   I have been looking for SetPrecision or something like that, but I
> > didn't find nothing (only TGNumberFormat, but there isn't any
> example).
> >
> >   I apologize for any inconvenience.
> >
> >   Thanks.
> >
> >   Best regards,
> >
> >                                                     Luis

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