Randomize just part of a Block

Question

Hey guys, I want to ask how to randomise just a part of blocks in each group.

The following code includes no randomisation. I want to randomise always the midline but just that line nothing else. Means Block 1 and 2 for the first and second scenario and Block 6 and 7 for the third and fourth.

I tried to insert RANDOMIZE() like this way:
...
ADD(RANDOMIZE("BlockList",1,2));
...

but it doesn't work. Any ideas?

Begin Unverified Perl
    if(VALUE("QuotaGroups")==1)
    {
        ADD("BlockList",3);
        ADD("BlockList",1,2);
        ADD("BlockList",5);
    }
    elsif(VALUE("QuotaGroups")==2)
    {
        ADD("BlockList",4);
        ADD("BlockList",1,2);
        ADD("BlockList",5);
    }
    elsif(VALUE("QuotaGroups")==3)
    {
        ADD("BlockList",8);
        ADD("BlockList",6,7);
        ADD("BlockList",10);
    }
    else
    {
        ADD("BlockList",9);
        ADD("BlockList",6,7);
        ADD("BlockList",10);
    }
End Unverified

Comments

Have you tried the version of RANDOMIZE that allows you to specify startindex and endindex? In your first block of instructions, under your         ADD("BlockList",1,2); you'd add RANDOMIZE(2,3); to randomize the 2nd and 3rd items currently on the list, which in this case would be items 1 and 2.

---

Thanks. It works fine!