Hi Stanislas,
Thanks for reporting this case with TH2::ProjectionX,Y.
The problem is now fixed in the CVS version.
Rene Brun
On Tue, 10 Sep 2002, Stanislav NESTEROV wrote:
>
> Hi, Rene,
> Again about PAW and ROOT compatibility...
> Recently I made some projections of 2d-histogramms, and noticed that
> in case of 2d-histogram with errors projected histograms in ROOT and PAW
> have different errors. I think PAW makes error calculation in this
> case more correctly than ROOT: ROOT actually calculates error bars without
> any respect to errors in original 2d-histogramm.
>
> Projection in PAW made by:
> PAW > prox 8399
> PAW > hi/proj 8399
> PAW > hi/pl 8399.prox
>
> Projection in ROOT made by:
>
> root [1] h8399->ProjectionX("_px",-1,-1,"e");
> root [2] h8399_px->Draw();
>
> May be important: I've used 2d-histograms with errs, produced via HBOOK
> package, then convert them into ROOT file by means of h2root utility. But
> I've checked the code of H2ROOT and there're lines that convert 2d-errors
> from PAW to ROOT...
>
> (ROOT-3.03/08 AFS-version for 7.2 redhat)
>
> Best regards,
> Stanislav.
>
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