turi::indexed_column_groupby Class Reference

#include <toolkits/util/indexed_sframe_tools.hpp>

Public Member Functions
	indexed_column_groupby (std::shared_ptr< sarray< flexible_type > > src_column, std::shared_ptr< sarray< flexible_type > > dest_column, bool sort, bool uniquify)
const std::vector< size_t > &	dest_group (size_t src_value) const

Detailed Description

Creates an in-memory group lookup table from one integer column to another. In this representation, all the items in one column associated with a given value in the other column can be retrieved by that value.

Definition at line 41 of file indexed_sframe_tools.hpp.

Constructor & Destructor Documentation

indexed_column_groupby()

turi::indexed_column_groupby::indexed_column_groupby	(	std::shared_ptr< sarray< flexible_type > >	src_column,
		std::shared_ptr< sarray< flexible_type > >	dest_column,
		bool	sort,
		bool	uniquify
	)

Builds a mapping of integer values in src_column to a vector of all the associated values in dest_column. This can be queried using dest_group.

If sort is true, then the returned elements are sorted.

If uniquify is true, then the returned vector has at most one of any given element.

Member Function Documentation

dest_group()

const std::vector<size_t>& turi::indexed_column_groupby::dest_group

(

size_t

src_value

)

const

Returns a vector with all the associated values in dest_column that have src_value in the corresponding location of src_column. If src_value does not appear in src_column, then the returned vector is empty.

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The documentation for this class was generated from the following file:

• toolkits/util/indexed_sframe_tools.hpp