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

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Rightia Rollmann
Rightia Rollmann 2018-7-24
编辑： Stephen23 2018-7-25
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?

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Rightia Rollmann
Rightia Rollmann 2018-7-24
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 个评论
Guillaume
Guillaume 2018-7-24
Follow the link in Stephen's comment to get the answer to your question, or do what Madhan told you.
Also, don't use the answer box for comments.
Stephen23
Stephen23 2018-7-25
编辑：Stephen23 2018-7-25
"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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更多回答（1 个）

madhan ravi
madhan ravi 2018-7-24
编辑：madhan ravi 2018-7-24
hi, see the link below:
https://www.mathworks.com/help/matlab/ref/rng.html

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