Libraries.Compute.Statistics.DataFrameColumn

This class represents a column on the system. Columns do not have a type themselves, but all subclasses can be made to have any arbitrary type, even custom ones. Columns by default can accept calculations, which send elements to the calculation of the appropriate type and conduct operations. DataFrame objects use the appropriate subclass of column automatically when reading in data frames from disk, based upon the first item in the spreadsheet. Note that in most cases, a user will not interact directly with this class. It is a parent class that encapsulates some common functionality, but typically one would pass a calculation or other operation to this class. If one needs to directly manipulate the data in a particular column, then a subclass must be used.

Columns may optionally add data from a text representation of that data. This can be in any arbitrary format determined by the column implementor.

This action conducts a calculation on this column. The calculation begins by issuing a Start action. Then if it is an iterable action, sends each data point to the class for processing. If not, it is asked to conduct the entire operation at once on the full data set. Finally, it issues an end action.

This action returns whether or not this column type can be converted to a Vector of numbers.

This action compares two object hash codes and returns an integer. The result is larger if this hash code is larger than the object passed as a parameter, smaller, or equal. In this case, -1 means smaller, 0 means equal, and 1 means larger. This action was changed in Quorum 7 to return an integer, instead of a CompareResult object, because the previous implementation was causing efficiency issues.

Example Code

Object o
        Object t
        integer result = o:Compare(t) //1 (larger), 0 (equal), or -1 (smaller)

Some column types can be converted to a raw vector of numbers. All other column types throw an error if they cannot convert.

This action conducts a deep copy of the column.

This action does a deep copy of the row between the 0-indexed rowStart and rowEnd.

This action determines if two objects are equal based on their hash code values.

Example Code

use Libraries.Language.Object
        use Libraries.Language.Types.Text
        Object o
        Text t
        boolean result = o:Equals(t)

Regardless of the type of the column, this action attempts to convert the item at the index to a number. Attrribute: Parameter index the item to be converted

This action gets the hash code for an object.

Example Code

Object o
        integer hash = o:GetHashCode()

This gets the header for this column.

This action returns the number of rows.

This action sends an individual data point to a calculation, typed appropriately by its subclass.

This sets the header for this column.

This action swaps two values in the column.