roboticus

Thank you for taking the time to comment on my script, particularly your 'comments on comments'. I certainly take you point about declaring variables close to where they are first used. It would make it easier to understand and remove my double commenting.

Thanks also for pointing out an alternative to my clunky code for defining when the output reached a boundary point. I should have worked on that a bit more ... the structure I used occurs four times in that script!

Regards

anita2R