Question with R-bridge and arc.data2sp()

[RichardKlosterman]

I have a questions about using R Bridge.

I'm using "input.sp <- arc.data2sp(input.arc)" after

"input.arc <- arc.select(arc.open("D:/R/Trend/ArcGIS/Popln_Trend.shp"))."

dim(input.arc) is [12 10] but  dim(input.arc) is [1 10]. How can I keep all 12 rows when I make the conversion?

Thanks!