Why does MATLAB generate identical random values after re-opening the program?

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I run the code below
y = rand(1,5)
and I get the following values:
0.8147 0.9058 0.1270 0.9134 0.6324
I close MATLAB and reopen it again and enter the same code and I get the same random values. Why does MATLAB create the exact same numbers each time?
  1 件のコメント
Stephen23
Stephen23 2018 年 7 月 24 日
編集済み: Stephen23 2018 年 7 月 24 日
"Why does MATLAB create the exact same numbers each time?"
Because:
  • computers can't really generate random numbers.
  • that is exactly what MATLAB is specified to do:

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採用された回答

Rightia Rollmann
Rightia Rollmann 2018 年 7 月 24 日
I set rng to 'default', so I expected that it'll generate new random numbers after re-running MATLAB, but that is not the case. Why? How can I get MATLAB to generate new random numbers after re-opening it?
  2 件のコメント
Stephen23
Stephen23 2018 年 7 月 25 日
編集済み: Stephen23 2018 年 7 月 25 日
"I set rng to 'default', so I expected that it'll generate new random numbers after re-running MATLAB..."
The rng documentation explains that the 'default' option as "This way, the same random numbers are produced as if you restarted MATLAB. The default settings are the Mersenne Twister with seed 0." Clearly with the same seed it will generate exactly the same values each time. That is what it is specified to do!

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その他の回答 (1 件)

madhan ravi
madhan ravi 2018 年 7 月 24 日
編集済み: madhan ravi 2018 年 7 月 24 日
hi, see the link below:
https://www.mathworks.com/help/matlab/ref/rng.html
  1 件のコメント
madhan ravi
madhan ravi 2018 年 7 月 24 日
did you try
rng('shuffle')

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