swapping numbers

I have a set of numbers say data=[3 5 7 1 2 15...100],having 100 values,i need to swap every element and need the answer in ascending order,i want to take first 20 values,swap,ten next 20swap,...please help

[Jan]

The question is not clear yet. Can you give a unique definition and a small example? What have you tried so far and which problems occurred - e.g. error messages?

Answer 1

[Andrei Bobrov]

this is?