Read Double data from a Text file containing labels. Skip the header, then read one double per line, which is the first
token in that line.
reader - reader
public int getData(double target,
Try to get length doubles from this DoubleDataSource, and copy them into target, starting from targetPos. This is the core
method getting the data. Subclasses may want to override this method. If an exception occurs reading from the underlying
reader, or converting data to double, the method will print a stack trace to standard error, but otherwise will silently
stop and behave as if all data was read.