tech.tablesaw.table

Class Relation

java.lang.Object

tech.tablesaw.table.Relation

Direct Known Subclasses:

Table, TableSlice

public abstract class Relation
extends Object

A tabular data structure like a table in a relational database, but not formally implementing the relational algebra

Constructor Summary

Constructors

Constructor and Description
Relation()

Method Summary

Modifier and Type	Method and Description
abstract Relation	addColumns(Column... cols)
TableConverter	as()
BooleanColumn	booleanColumn(int columnIndex)
BooleanColumn	booleanColumn(String columnName)
BooleanColumn[]	booleanColumns()
CategoricalColumn	categoricalColumn(int columnNumber)
CategoricalColumn	categoricalColumn(String columnName)
abstract void	clear() Clears all the dat in the relation, leaving the structure intact
abstract Column	column(int columnIndex) Returns the column at columnIndex (0-based)
Column	column(String columnName) Returns the column with the given columnName, ignoring case
abstract int	columnCount() Returns the number of columns in the relation
abstract int	columnIndex(Column col) Returns the index of the given column
int	columnIndex(String columnName) Returns the index of the column with the given columnName
abstract List<String>	columnNames()
abstract List<Column>	columns() Returns a list of all the columns in the relation
List<Column>	columns(int... columnIndices) Returns the columns whose indices are given in the input array
List<Column>	columns(String... columnName) Returns the columns whose names are given in the input array
List<Column>	columnsOfType(ColumnType type)
ColumnType[]	columnTypes() Returns an array of the column types of all columns in the relation, including duplicates as appropriate, and maintaining order
int[]	colWidths() Returns an array of column widths for printing tables
boolean	containsColumn(Column column)
DateColumn	dateColumn(int columnIndex)
DateColumn	dateColumn(String columnName)
DateColumn[]	dateColumns()
DateTimeColumn	dateTimeColumn(int columnIndex)
DateTimeColumn	dateTimeColumn(String columnName)
DateTimeColumn[]	dateTimeColumns()
abstract Table	first(int nRows)
abstract String	get(int r, int c) Returns a String representing the value found at column index c and row index r
String	getUnformatted(int r1, int c)
boolean	isEmpty()
abstract String	name() Returns the name of this relation
NumberColumn	nCol(int columnIndex) Returns the column with the given name cast to a NumberColumn
NumberColumn	nCol(String columnName) Returns the column with the given name cast to a NumberColumn
NumberColumn	numberColumn(int columnIndex)
NumberColumn	numberColumn(String columnName)
NumberColumn[]	numberColumns()
String	print()
String	print(int rowLimit)
String	printAll()
abstract Relation	removeColumns(Column... columns) Removes the given columns from the receiver
Relation	removeColumns(int... columnIndexes)
Relation	removeColumns(String... columnName)
abstract int	rowCount() Returns the number of rows in the relation
abstract Relation	setName(String name)
String	shape()
StringColumn	stringColumn(int columnIndex)
StringColumn	stringColumn(String columnName)
StringColumn[]	stringColumns()
Table	structure()
String	summary()
TimeColumn	timeColumn(int columnIndex)
TimeColumn	timeColumn(String columnName)
TimeColumn[]	timeColumns()
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Relation

public Relation()

Method Detail

addColumns

public abstract Relation addColumns(Column... cols)

setName

public abstract Relation setName(String name)

isEmpty

public boolean isEmpty()

shape

public String shape()

removeColumns

public Relation removeColumns(int... columnIndexes)

removeColumns

public abstract Relation removeColumns(Column... columns)

Removes the given columns from the receiver

removeColumns

public Relation removeColumns(String... columnName)

columnsOfType

public List<Column> columnsOfType(ColumnType type)

first

public abstract Table first(int nRows)

columnIndex

public int columnIndex(String columnName)

Returns the index of the column with the given columnName

column

public Column column(String columnName)

Returns the column with the given columnName, ignoring case

column

public abstract Column column(int columnIndex)

Returns the column at columnIndex (0-based)

Parameters:

columnIndex - an integer at least 0 and less than number of columns in the relation

Returns:

the column at the given index

columnCount

public abstract int columnCount()

Returns the number of columns in the relation

rowCount

public abstract int rowCount()

Returns the number of rows in the relation

columns

public abstract List<Column> columns()

Returns a list of all the columns in the relation

columns

public List<Column> columns(String... columnName)

Returns the columns whose names are given in the input array

columns

public List<Column> columns(int... columnIndices)

Returns the columns whose indices are given in the input array

columnIndex

public abstract int columnIndex(Column col)

Returns the index of the given column

get

public abstract String get(int r,
                           int c)

Returns a String representing the value found at column index c and row index r

name

public abstract String name()

Returns the name of this relation

clear

public abstract void clear()

Clears all the dat in the relation, leaving the structure intact

columnNames

public abstract List<String> columnNames()

columnTypes

public ColumnType[] columnTypes()

Returns an array of the column types of all columns in the relation, including duplicates as appropriate, and maintaining order

colWidths

public int[] colWidths()

Returns an array of column widths for printing tables

toString

public String toString()

Overrides:

toString in class Object

printAll

public String printAll()

print

public String print(int rowLimit)

print

public String print()

structure

public Table structure()

summary

public String summary()

booleanColumn

public BooleanColumn booleanColumn(int columnIndex)

booleanColumn

public BooleanColumn booleanColumn(String columnName)

numberColumn

public NumberColumn numberColumn(int columnIndex)

numberColumn

public NumberColumn numberColumn(String columnName)

stringColumns

public StringColumn[] stringColumns()

numberColumns

public NumberColumn[] numberColumns()

booleanColumns

public BooleanColumn[] booleanColumns()

dateColumns

public DateColumn[] dateColumns()

dateTimeColumns

public DateTimeColumn[] dateTimeColumns()

timeColumns

public TimeColumn[] timeColumns()

categoricalColumn

public CategoricalColumn categoricalColumn(String columnName)

categoricalColumn

public CategoricalColumn categoricalColumn(int columnNumber)

nCol

public NumberColumn nCol(String columnName)

Returns the column with the given name cast to a NumberColumn

Shorthand for numberColumn()

nCol

public NumberColumn nCol(int columnIndex)

Returns the column with the given name cast to a NumberColumn

Shorthand for numberColumn()

dateColumn

public DateColumn dateColumn(int columnIndex)

dateColumn

public DateColumn dateColumn(String columnName)

timeColumn

public TimeColumn timeColumn(String columnName)

timeColumn

public TimeColumn timeColumn(int columnIndex)

stringColumn

public StringColumn stringColumn(String columnName)

stringColumn

public StringColumn stringColumn(int columnIndex)

dateTimeColumn

public DateTimeColumn dateTimeColumn(int columnIndex)

dateTimeColumn

public DateTimeColumn dateTimeColumn(String columnName)

as

public TableConverter as()

getUnformatted

public String getUnformatted(int r1,
                             int c)

containsColumn

public boolean containsColumn(Column column)