matlab R2020b randperm fuction is not random

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俊 马
俊 马 2022-7-14
评论： 俊 马 2022-7-19
Hi,
When I use matlab R2020b on linux platform, commands follow：
order = randperm(10)
disp(order)
results show:
6     3     7     8     5     1     2     4     9    10
6     3     7     8     5     1     2     4     9    10
Curiously, the result is fixed，i.e., when I run this script again, the same results appear. Does anybody know what's wrong? thanks
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Adam Danz
Adam Danz 2022-7-14
Ran in:
Make sure you're using MATLAB's randperm function by using which
which randperm
built-in (/MATLAB/toolbox/matlab/randfun/randperm)
Does the same result occur if you shuffle the random number generator?
randperm(10)
rng('shuffle')
randperm(10)

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Fangjun Jiang
Fangjun Jiang 2022-7-14
Ran in:
Duh! You store the result in "order" and display it again. Of course they are the same!
order = randperm(10)
order = 1×10
5 7 6 10 3 1 4 9 2 8
disp(order)
5 7 6 10 3 1 4 9 2 8
order = randperm(10)
order = 1×10
6 7 5 10 3 8 1 2 9 4
disp(order)
6 7 5 10 3 8 1 2 9 4

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