R, moving every other value in a column to a second column

Hello,

I have been tasked with manipulating the data ina a vector of 900 values in a form of a column. Every two values signifies a lenght and weight number. I need to find a R script to move every other value to their seperate column; one column as lenght and one as width. As an end point, I will need two columns; each with 450 values instead of 900. I would appreciate any assistance.

Thank you