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How can I create a random vector with at most 1 in it?

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I tried to make a random vector of 0's and 1's like the code below:
v = round(rand(1,n)) % where n is the dimension of the vector
But I'd like to give it a condition to avoid the existence of 1 more than one time. Also, I want the index to be selected randomly.
For example, this:
[1 1 0 0] % where n = 4
is not accepted, but this:
[1 0 0 0]
%or
[0 1 0 0]
either of them will be accepted.
So any help please? Thanks!

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Accepted Answer

Guillaume
Guillaume on 27 Jun 2018
Edited: Guillaume on 27 Jun 2018
Another option:
v = randperm(n) == n
or
v = randperm(n) == 1

  2 Comments

Stephen Cobeldick
Stephen Cobeldick on 27 Jun 2018
Very neat, but this always contains one 1, whereas the title asks for "...with at most 1", which would include the possibility of zero 1's. This could be solved easily:
randperm(n)==randi(0:1)
Ezz El-din Abdullah
Ezz El-din Abdullah on 27 Jun 2018
Thanks a lot Guillaume and Stephen. Appreciate your help, both :)

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