[ROOT] questions on histogram errors

From: Stephane Plaszczynski (plaszczy@lal.in2p3.fr)
Date: Thu Sep 18 2003 - 09:10:38 MEST


hello,

In encounter rthe follwoing problems with error bars on TH1F:

1/I put some errors to one histo in my analysis.
Now I can't get rid of them when plotting it!
h1->Draw("P") still draws the error bars...Is there a way of drawing
only the points values?

2/I have a ntuple with "x y sigma_y". Is there a direct way to plot
y vs x with sigma_y errors on y  (other than MakeClass...)?

3/I plot some histos on my canvas.
I then want to add some points from a tuple.
when I incoporate
"tuple->Draw("y:x","",""same");
to my script I don't see any oupput (even with a c1->Update)

if I do it interactively it works...
(I am using Root3.05)

thanks

stephane



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