Finding voltage between nodes

Hello,

Is there any simple way to find the voltage between two arbitrary nodes?

By now I can achieve it doing:

gnucap> store op v(nodes)
gnucap> op
gnucap> measure va=at(probe="v(2)")
gnucap> measure vb=at(probe="v(5)")
gnucap> eval va-vb

But I consider this a bit cumbersome, specially the "measure" sentences.

Orestes.