Origin 8 doesn't support the full range calculation. We may implement it in the later version. However, you can define a range variable in the "Before Formula Scripts":
range aa = [Book1]Infratek!col(Irms);
range bb = [Book1]Oszilloskop!col(Irms);
and then use these range variables on the Set Column Value dailog
col(c) = aa - bb;
Thanks
Larry
OriginLab Technical Services