what is the best way to select everything between 1st and the last point?
what I have now is Group Expression:
Screenshot [www.dropbox.com]
and not sure what I should write to group2.
Also, I've tried wrangler where I put these values:
f@group_first = @ptnum == 0; f@group_second = @ptnum == `npoints(0)-1`;
but don't know how to write that group_thrid (is everything but not)group_first,group_second.
Many thanks for your help!
