Plot different number of entries

[router]

Hallo rooters,

I’ve got two trees with different number of entries I want to plot together in a TH1. My values are generated by a measuring system. My first tree contains the voltage values and my second tree contains the amperage values.

The measuring system records the voltage in a time step which is a bit smaller than the step of the amperage. So I get a different number of entries, but the time-range is the same. In my plot the amperage-range is too short when I plot both trees togehter.

Is there any method where I can “stretch” the binx-length?

Thanks!

[Wile_E_Coyote]

Can we shift histogram for several channels?

Good day, everyone here! Can anyone give me some informations about these two questions: 1)If I already have a histogram, can I shift this histogram for several channels in the X axis? For example, when I want to calibrate the energy spectrum, E=a*chn+b, where “a” & “b” is the constants, “chn” is the original x axis, “E” is the new x axis. How can I realize that? 2)During my data analysis, I found that sometimes the cut sequence will affect the result. For instance, A. h1->Draw(“fast:slow>>h…

BTW. I don’t know how you fill your histograms, but you could also directly modify/scale the “x” value when you call the TH1::Fill method.

[router]

Thank you for the link!

I fill my hist with the TH1::Fill method, so this is a good point. I’ll try it.