ExtractTaxa() returns a matrix with n rows, each named for the
relevant taxon, and c columns,
each corresponding to the respective character specified in character_num.
NexusTokens() returns a character vector in which each entry
corresponds to the states of a phylogenetic character, or a list containing
an error message if input is invalid.
Arguments
matrixLines
Character vector containing lines of a file that include
a phylogenetic matrix. See ReadCharacters() for expected format.
character_num
Index of character(s) to return.
NULL, the default, returns all characters.
session
(Optional) A Shiny session with a numericInput named
character_num whose maximum should be updated.
continuous
Logical specifying whether characters are continuous.
Treated as discrete if FALSE.
tokens
Vector of character strings corresponding to phylogenetic
tokens.