How to use randperm with minimum spacing between random numbers

Hi

I would like to use randperm but be able to specify the minimum separation between the random numbers generated. Please advise.

p = randperm(n,k) returns a row vector containing k unique integers selected randomly from 1 to n inclusive.

I would like to have the k intergers to have atleast a separation of say b when sorted.

Thanks

Gordon

[Guillaume]

What sort of values are n, k and b? If n>>k and n>>b then you could just retry randperm until you've got a set that satisfies your condition.

Answer 1

[Bruno Luong]

n=20;
k=3;
b=7;

[as,is]=sort(randperm(n-(k-1)*(b-1),k)); % if it throws an error then b/k/n are not compatible
a = as + (0:k-1)*(b-1);
a = a(is)

[Mohd Faisal Ansari]

Hello Sir, The above code is for the range from 0 to n

please help me to edit the code so that it works between range a to b

Thank you

[Guillaume]

Use the exact same code to get numbers between 0 and (b-a), then add a to all the numbers, presto, you have numbers between a and b.

Answer 2

[James Tursa]

Maybe something like this will suffice for your needs?

p = b * randperm(floor(n/b),k)

If n/b isn't an integer value, then there be some "missing" higher numbers. (Or could adjust this so the "missing" numbers are the lower numbers or are perhaps randomly scattered throughout the range).

[Mohd Faisal Ansari]

Hello Sir, The above code is for the range from 0 to n

please help me to edit the code so that it works between range a to b

Thank you.