Creating a function that does the same as myrandperm(n,k)

I have to create a function,which does the same as myrandperm(n,k). I thought of creating a for loop which goes from 1 to k in which an array p(i) gets initialised by a random integer of an array n. And then p(i) gets deleted from from the array n.

But I didnt found a function that gives me a random integer from an array.

Do you guys have any ideas?

Answer 1

[Walter Roberson]

randi(length(n))

[Furkan Karaman]

Hello Walter,

that does not work because length just returns the number of elements.

For example:

I have an array like d=[1 5 7 9 ] ,

I want to take randomly a number from it. For example in the first attempt I take 5. And then 5 gets deleted from that array.

In the second attempt I have to take a random number from [1 7 9]

[Rik]

Why can't you use randperm? It sounds like it does exactly what you need.

[Walter Roberson]

random index = randi(length(d))
random value = d(random index)
delete entry "random index" from d
 lathe, rinse, repeat

[Furkan Karaman]

@Rik ,because our professor does not want it, as a challenge for us.

@Walter thank you