A table-reading function can be associated with an agent with
set_read_fn(). If a data table is already associated with an agent, it
will act as the target table (i.e., the agent will disregard the
table-reading function). However, if there is no data table associated with
the agent then the table-reading function will be invoked. We can always
remove a data table associated with an agent with the remove_tbl()
function. There are two ways to specify a read_fn: (1) using a function
(e.g., function() { <table reading code> }) or, (2) with an R formula
expression (e.g., ~ { <table reading code> }).
set_read_fn(agent, read_fn)An agent object of class ptblank_agent that is created with
create_agent().
A function that's used for reading in the data. If a table is
not associated with the agent then this function will be invoked. Should
both a tbl and a read_fn be associated with the agent, the tbl
will take priority. There are two ways to specify a read_fn: (1) using a
function (e.g., function() { <table reading code> }) or, (2) with an R
formula expression (e.g., ~ { <table reading code> }).