mark_string: Mathematical mark of an ordered string vector
Description
Take two vectors: a ordered vector of numeric
and the corresponding of strings. Then compare each term
of the ordered suit of numeric and add "=", ">" or "<"
at the end of each string.
Usage
mark_string(vNum, vStr)
Arguments
vNum
an ordered (increasing or decreasing) vector of numerics.
vStr
the corresponding ordered vector of strings.
Value
The vector of strings with added mathematical symbol.