
Concatenate lowercase and uppercase letters used in the package functClust.
fletters()
Return the vector of letters used in the package functClust.
The vector of letters is c(letters, LETTERS)
,
which corresponds to lowercase letters, followed by uppercase letters.
fepsilon
returns a value for epsilon.
fletters
returns a vector of lowercase
then uppercase letters.
fcolours
returns a vector of colours.
fsymbols
returns a vector of fsymbols.