>I suspect it's that the data isn't a list of lists. >If tBlock1/2 are themselves lists then this should work, but if they're >tables then the data just looks like > >[1,2] and doesn't look like [[1,2]]. > > I've got it working now, thanks. You're right, it wasn't a list of lists. tBlock1/2 were both just Table objects. Thanks anyway, Shayan Raghavjee St. James Software