Concatenate Data to Make Character Data
DESCRIPTION:
Returns a vector of character strings which is the result of pasting corresponding elements of the input vectors together. If the collapse argument is used, a single string is returned.
USAGE: 
paste(..., sep=" ", collapse=NULL)
REQUIRED ARGUMENTS:
...:
vectors which may be either numeric, logical, complex, or character. All arguments are coerced to mode character. Missing values (NAs) are allowed.
OPTIONAL ARGUMENTS:
sep=:
the character string to be inserted between successive arguments. Can be "" for no space. The default is a single space.
collapse=:
character string to use in collapsing the result. By default, no collapsing is done.
VALUE:
character vector, with length equal to the maximum of the lengths of the arguments (unless collapse is given, in which case the length is 1).
DETAILS:
The i-th element of the result is the concatenation of the i-th elements of the arguments. If the length of any argument is less than the maximum, elements of that argument are repeated cyclically. In particular, an argument can be a single element, to appear in each element of the result. If collapse is given, all of the strings produced are finally collapsed into one long string with the collapse string inserted between elements.
SEE ALSO:
character , nchar , deparse .
EXAMPLES: 
paste("no.",1:10)    # gives "no. 1", "no. 2" ...


outer(month.name, years, paste) # each month-year combination is produced


paste(1:10,collapse="") # produces "12345678910"


paste(state.name,"pop =",pop)   # "Alabama pop = 12.345"...