summation of histograms

From: nasim <nasim_at_hep.man.ac.uk>
Date: Mon, 30 Jan 2006 19:11:10 +0000 (GMT)

Hi,

If we have two or more written histograms with the same name in two different files. how we can find the sum of these histograms (H1+H2+...)or (H1-H2);

Thanks for any help.

Nasim. Received on Mon Jan 30 2006 - 20:11:16 MET

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