[R] dataframe conversion

[Pieter Provoost]

The data structures in R are still very puzzling to me. Can anyone tell 
me how I can easily convert these two dataframes to one single dataframe 
with two columns (mean and sd) with 7 rows?

 > meanprofile
       V1       V2       V3       V4       V5       V6       V7
2292.001 2178.620 1654.310 1784.004 1160.052 1142.061 1046.675
 > sdprofile
       V1       V2       V3       V4       V5       V6       V7
310.6714 347.2072 197.2464 532.3916 161.2955 227.3634 108.5017

Thanks!
Pieter