How to correctly display TCanvas in Jupyter notebook

ROOT
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21

This that I do not understand.
Can you try the same with %jsroot off?

22

In the second cell, you run draw_phaseshift(...) for the first time, the canvas dispaly well

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图片1155×737 38.6 KB

If I run this cell again, the canvas disappear

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图片924×275 9.21 KB

Canvas.ipynb with situation as the second picture shows is updated in github: asdw159632/canvas_problem.

23

I upload modified Canvas.ipynb - it really missing second plot. Also when checking in file sources.

I suspect here some python ownership problems that histogram or canvas deleted in-between and this not correctly recognized by pyroot.

To overcome such problem - try create new canvas with different name before start drawing.

24

I see, so it’s better to recreate a new canvas when I want to draw a new figure.

But when I open a new cell and run c1.Draw() without tuning axis ranges, the canvas will appear again in the new cell’s output as I upload Canvas.ipynb shows.