NAME2IND  Convert category name to index

     IND=NAME2IND(LL,N)

 INPUT
    LL    SDLIST object
    N     String, character array or cell array with category names

 OUTPUT
    IND   Index of category in the list object

 DESCRIPTION
 NAME2IND converts category names to indices.  N may be a string,
 character array or cell array of strings.
 If any of the names in N does not exist in LL, empty IND is returned.

 SEE ALSO
 IND2NAME, GETNAMES