Thanks, That is useful, I appreciate the help. Cheers, Mike

Yes, but what I meant to ask (perhaps I wasn't clear) is can I do this with an array (vector, matrix) that does have units? Stripping out the unit in the argument works, so that is useful, but is this the only effective way? Cheers Mike

Thanks, part of your answer got cut off, but I'll try it out. Cheers

Thanks, part of your answer got cut off, but I'll try it out. Cheers