環境:
ubuntu18.10-64位
Octave4.4-64位

問題重新：
繪制圖片后無法關閉。
核心思想就是更換圖片繪制工具，
把stackoverflow上面的答案粘貼如下：
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The problem is likely to be the graphics toolkit which your installation of Octave is using.

To check this, type

graphics_toolkit

in the Octave command line.

If the response is fltk and your plot window is freezing, then switch the default toolkit to gnuplot:

graphics_toolkit("gnuplot")

Test that the problem is fixed: x=1:10; y=x.^2; plot(x,y)

Make the change permanent in your octave.rc file, located in your Octave installation directory:

On Windows: \Octave\share\octave\site\m\startup\octaverc On Linux: ~/.octaverc

Still not working?
If response is qt, try either fltk or gnuplot (one may be faster than the other).

If the above does not work, you may need to install/re-install gnuplot. (thanks to lukas and saurabh for this edge case).

###################################################################################################

~/.octaverc中加入：

graphics_toolkit("fltk")

重啟octave后即可永久生效。

Reference:
https://stackoverflow.com/questions/12032494/plot-window-not-responding

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