You must open the file in "update" mode
TFile in("file.root","update");
Rene Brun
On Sun, 4 Jan 2004, Peter H Fisher
wrote:
> Hi,
>
> It is not clear to me how to purge cycles of, for example, histograms.
> For example, I try,
>
> TFile in("file.root")
> gDirectory->Purge()
>
> and do not get any sort of error, but the old version do not go away.
> Does anyone have a howto?
>
> Peter
>
>
> Peter Fisher Office 617-253-8561
> Professor of Physics Fax 617-253-4100
> 44-118 MIT email fisherp@mit.edu
> Cambridge, MA, 02139
>
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