[plt-scheme] "Zipping" two lists?

At 10:28 AM -0800 2/22/06, Greg Woodhouse wrote:
>Does Scheme provide a standard way to do this? I wrote a little ad hoc
>function, but it seems that this ought to be common enough an operation
>to have a standard solution.
>
>;;zip two list (e.g., (zip (1 2) (3 4)) is ((1 3) (2 4)))

Another name for this is "transposing a matrix", if you represent a 
matrix as a list of its rows, each of which is a list of numbers.

-- 
					Stephen Bloch
					sbloch at adelphi.edu