Description Usage Format Methods
Class to provide the functionality of treating a static, finite datatable as a stream of incomming data.
1 |
An object of class R6ClassGenerator
of length 24.
initialize(dataset = NULL, url = NULL, verbose = FALSE)
This method is used to create object of this class. One can provide
either a datatable
or a url
pointing to a data.frame /
csvfile (the class uses read.csv
, and it should be compatible with the
default arguments of that function). Note that the latter is only used
if the provided datatable
is NULL
. The function will raise
an error if both dataset and url are NULL
.
@param dataset (default = NULL) is a datatable to read the data from
@param url (default = NULL) is a datatable to read the data from if no
dataset is available
@param verbose (default = FALSE) the verbosity to be used for logging
getNext()
Method to retrieve the next observation from the data frame. @return data.table a row from a datatable
getNextN(n = 1)
Method that returns the next n
observations. This function can be
used to bootstrap an initial model or to get a minibatch of
observations. Note that the function will always try to return data. If
one asks for n observations, it will check if there are still n new
observations. If not, it will return all observations still available.
If there are no observations available, it will return null.
@param n (default = 1) the number of measurements requested
@return datatable a row or number of rows from a datatable, NULL if n
<= 0
reset
Active function. Method to reset the pointer to the beginning of the datatable.
get_all
Active function. Method to retrieve the whole dataset at once.
@return data.table the data.table
as set when initializing the object
get_length
Active function. Method to retrieve the number of rows in the dataframe @return integer the number of rows in the dataframe. 0 and a warning if no data is set.
get_remaining_length
Active function. Method to retrieve the number of rows still remaining in the dataframe @return integer the remaining number of rows in the dataframe.
get_currentrow
Active function. Method to retrieve pointer to the current row in the data frame. @return integer the current row in the dataframe. 1 if no data is set.
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