Generating random number from a given sequence.

Hello, I am generating a random sequence of channels one after another based on its availability. The way i'm doing it is like this. It is working fine but i don't like the way i have implemented it. Can you suggest a more efficient method for doing the same thing. Thank you.

                              idle=0;  
                              ava_channelsabs=find(channelstate_abs(idabs,abs_idbeam,:)==idle);
                              col_slot1=[];
                              while length(col_slot1)<length(ava_channelsabs)
                                  rand_slot1=randi(length(ava_channelsabs),1,1);
                                  check=ismember(rand_slot1,col_slot1);
                                  if check==0
                                      rand_channel1=ava_channelsabs(rand_slot1);
                                      col_slot1=[col_slot1,rand_slot1];
                                 end
                              end

Answer 1

[Steven Lord]

It sounds like you want to perform sampling without replacement. If that's the case take a look at the randperm function.