specified numbers of random permutation of a vector

randperm(n) returns a row vector containing a random permutation of the integers from 1 to n inclusive but I need random permutation of the integers from a vector, also I don't need all off them just specified number e.g. 100.

[Walter Roberson]

Duplicates https://www.mathworks.com/matlabcentral/answers/437825-how-could-i-find-specified-number-of-permutation-of-a-vector

Answer 1

[mehdi J]

I did it by myself as below:

for k=1:MatSize
    ind=randperm(numel(vec));
    Mat(k,:)=vec(ind);
end

Answer 2

[madhan ravi]

Perhaps random indexing like below?

vector(randperm(100)) % 100 a specified number

Answer 3

[Stephen23]

Where V is your vector:

idx = randperm(n);
V(idx(1:100))

Answer 4

[Walter Roberson]

See https://www.mathworks.com/matlabcentral/answers/437792-sampling-with-periodic-replacement#answer_354533