for-loop for non consecutive ranges

Good morning folks,

normally a for loop would be defined as :

Please Login or Register  to view this content.

But what I am looking for would be one loop covering for example 1 to 10 and 16 to 20, as all these columns would require the same code to be run on them, whil the columns in 11 to 15 would need to be addressed diferently.
Is this at all possible, or do I simply have to live with three loops (1-10, 11-15 and 16-20) instead of reducing their number?

Sincerely yours
John

Hi grendel_42
something like

Please Login or Register  to view this content.