The Show() solution of class TCanvas did not work

ROOT
1

in my projection, the Show() solution of class TCanvas was used to show canvas,
but it did not work, what is the probable reason?
ROOT Version: 6.28/04
Platform: Ubuntu 20.04
Compiler: GCC 9.4.0

2

We need a bit more information to answer your question. Can you send a small script reproducing the problem?

3

@couet , thanks for your reply, the problem has been solved throught add class TApplication.

4

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