Assign character names to input variables (data matrix columns):

dimnames(x) <- vnames(x,names)

Required arguments:

   x = data matrix.
   names = vector of character names for columns of x.
           length(names) must equal ncol(x).
           Each name can be at most ten characters.

Example:

   dimnames(xdata) <- vnames(xdata,c("sex","age","occup","educat","income"))

Remarks:

   There are a variety of ways in S to assign character names to columns (and
   rows) of a matrix. This function is provided for convenience.