Dear All I need an help to crosscheck my code when extracting 1D plot from 2D histogram (attached picture). The results from depth 10mm is higher than 130mm which if refer to 2D histogram the depth at 130mm must be higher. here the code which I use: TH1D* total10 = Lattotaldoseproton->Projection…

That’s TAxis::FindFixBin: auto yaxis = Lattotaldoseproton->GetYaxis(); auto bin130 = yaxis->FindFixBin(130); TH1D* total130 = Lattotaldoseproton->ProjectionX(“total130”, bin130, bin130);

Thank you so much for your reply, but actually it not answer the question yet. I have try the code in that discussion TH1D* total10 = Lattotaldoseproton->ProjectionX(“total10”, 10, 10); TH1D* total130 = Lattotaldoseproton->ProjectionX(“total130”, 130, 130); but it still not give the true result,…

The 130 in ProjectionX is the bin number, not the axis value. What is the Y-axis of Lattotaldoseproton?

Thank you so much for your kind answer, axel. Could you please suggest how to take the Y axis value instead of bin number? Y-axis is the depth, and X-axis is lateral, its actually lateral dose profile in 30x30x30 phantom.

Dear Axel, Thank you so much for your helps, it work well and solved my problem/ Cheers

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Ambiguous results when extracting 1D from 2D

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dastudillo January 6, 2021, 7:33am 2

ProjectionX of different Y bin ROOT

I have a TH2D, and I want to make X projections for the different Y bins. I have 9 Ybin and I want to save the individual X projection of Y as 1D when I do TH1D* t3= time_L3->ProjectionY(“t3-t7”,4,5), t3->Draw(); it give me the correct histo but when i do the second bin TH1D* t4= time_L3->ProjectionY(“t3-t8”,7,8), t4->Draw(); it add the second histo to the first and give me both the first and second bin histo etc. please I have no idea what to do.

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