Pseudo random number sequence with non-repeating elements

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ANJANA KRISHNAN A
ANJANA KRISHNAN A 2017-3-12
评论： the cyclist 2017-3-12
I want to generate a pseudo random number sequence which doesn't repeat any of its elements.
For example,I need 25 elements in that sequence,the values of elements ranges from 1 to 25,and no elements should be repeated.(Actually,the number of elements i need in that sequence is very large).
Also,this sequence should be reconstructable (using a seed) later.
How can i do that?I read about randperm. But i think its not suitable in this case.

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回答（1 个）

the cyclist
the cyclist 2017-3-12
Why do you think randperm is not what you need? It seems right to me.
rng(1234) % Set a seed for reproducibility
randperm(25) % Generate integers from 1:25, without replacement
  2 个评论
ANJANA KRISHNAN A
ANJANA KRISHNAN A 2017-3-12
This gives me actually what i need.Bt i'm not sure whether it will work that much fast for large number of elements.
the cyclist
the cyclist 2017-3-12
I'm not sure how fast you need. On my machine, this method generated 100,000,000 elements in 7 seconds.

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