find closest match between two vectors

Dear list,


I hope I can define my problem in an understandable manner. I seek  
some funktion that finds me the index of the value in a vector 1  
that is the least bigger then the value in another vector 2. And  
this for all values in vector 2.

For example:


vector 1 : c(1,2,6)

vector 2 : c(0,0.5,1,2,3,8)


the result should be as long as vector 2 and give the indices of the  
corresponding elements in vector 1:

result: c(1,1,2,3,3,NA)

Any suggestions how to do this without doing complicated loops  
through vector 2?