persist_test
  MATLAB/Octave version 9.8.0.1380330 (R2020a) Update 2
  Demonstrate how a PERSISTENT variable can be used
  in a lower level function, to store a value between calls.

     I  Plus Total

     1     8     8
     2     9    17
     3     1    18
     4     9    27
     5     6    33

persist_test
  Normal end of execution.