Column (tablesaw-core 0.11.8 API)

All Known Subinterfaces:

BooleanColumnUtils, BooleanMapUtils, CategoryColumnUtils, CategoryFilters, CategoryReduceUtils, DateColumnUtils, DateMapUtils, DateTimeColumnUtils, DateTimeMapUtils, DoubleColumnUtils, FloatColumnUtils, IntColumnUtils, IntMapUtils, LongColumnUtils, LongMapUtils, NumericColumn, ShortColumnUtils, ShortMapUtils, StringMapUtils, TimeColumnUtils, TimeMapUtils

All Known Implementing Classes:

AbstractColumn, BooleanColumn, CategoryColumn, DateColumn, DateTimeColumn, DoubleColumn, FloatColumn, IntColumn, LongColumn, ShortColumn, TimeColumn
```
public interface Column
```
The general interface for columns.
Columns can either exist on their own or be a part of a table. All the data in a single column is of a particular type.

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method and Description
`void`	`append(Column column)`
`void`	`appendCell(String stringValue)`
`byte[]`	`asBytes(int rowNumber)` Returns the contents of the cell at rowNumber as a byte[].
`int`	`byteSize()` Returns the width of a cell in this column, in bytes.
`void`	`clear()`
`ColumnMetadata`	`columnMetadata()`
`int`	`columnWidth()`
`String`	`comment()`
`Column`	`copy()` Returns a deep copy of the receiver
`int`	`countMissing()` Returns the count of missing values in this column.
`int`	`countUnique()` Returns the count of unique values in this column.
`Column`	`difference()` Returns a new column of the same type as the receiver, such that the values in the new column contain the difference between each cell in the original and it's predecessor.
`Column`	`emptyCopy()` Returns a copy of the receiver with no data.
`Column`	`emptyCopy(int rowSize)` Returns an empty copy of the receiver, with its internal storage initialized to the given row size.
`default String`	`first()`
`default Column`	`first(int numRows)`
`String`	`getString(int row)` Returns a string representation of the value at the given row.
`String`	`id()` Returns a unique string that identifies this column.
`boolean`	`isEmpty()` Returns true if the column has no data
`Selection`	`isMissing()`
`Selection`	`isNotMissing()`
`default String`	`last()`
`default Column`	`last(int numRows)`
`String`	`metadata()` Returns a String containing the column's metadata in json format.
`String`	`name()` Returns the column's name.
`String`	`print()`
`default RollingColumn`	`rolling(int windowSize)`
`it.unimi.dsi.fastutil.ints.IntComparator`	`rowComparator()`
`void`	`setComment(String comment)`
`Column`	`setName(String name)` Sets the columns name to the given string
`int`	`size()`
`void`	`sortAscending()`
`void`	`sortDescending()`
`default Column`	`subset(Selection rows)`
`Table`	`summary()`
`default String`	`title()`
`default double[]`	`toDoubleArray()`
`ColumnType`	`type()` Returns this column's ColumnType
`Column`	`unique()` Returns a column of the same type as the receiver, containing only the unique values of the receiver.

- Method Detail
  - size
```
int size()
```
  - summary
```
Table summary()
```
  - subset
```
default Column subset(Selection rows)
```
  - countMissing
```
int countMissing()
```
    Returns the count of missing values in this column.
    
    Returns:
    
    missing values as int
  - countUnique
```
int countUnique()
```
    Returns the count of unique values in this column.
    
    Returns:
    
    unique values as int
  - unique
```
Column unique()
```
    Returns a column of the same type as the receiver, containing only the unique values of the receiver.
    
    Returns:
    
    a Column
  - name
```
String name()
```
    Returns the column's name.
    
    Returns:
    
    name as String
  - setName
```
Column setName(String name)
```
    Sets the columns name to the given string
    
    Parameters:
    
    name - The new name MUST be unique for any table containing this column
    
    Returns:
    
    this Column to allow method chaining
  - type
```
ColumnType type()
```
    Returns this column's ColumnType
    
    Returns:
    
    ColumnType
  - getString
```
String getString(int row)
```
    Returns a string representation of the value at the given row.
    
    Parameters:
    
    row - The index of the row.
    
    Returns:
    
    value as String
  - emptyCopy
```
Column emptyCopy()
```
    Returns a copy of the receiver with no data. The column name and type are the same.
    
    Returns:
    
    a empty copy of Column
  - copy
```
Column copy()
```
    Returns a deep copy of the receiver
    
    Returns:
    
    a Column
  - emptyCopy
```
Column emptyCopy(int rowSize)
```
    Returns an empty copy of the receiver, with its internal storage initialized to the given row size.
    
    Parameters:
    
    rowSize - the initial row size
    
    Returns:
    
    a Column
  - clear
```
void clear()
```
  - sortAscending
```
void sortAscending()
```
  - sortDescending
```
void sortDescending()
```
  - isEmpty
```
boolean isEmpty()
```
    Returns true if the column has no data
    
    Returns:
    
    true if empty, false if not
  - appendCell
```
void appendCell(String stringValue)
```
  - id
```
String id()
```
    Returns a unique string that identifies this column.
    
    Returns:
    
    the unique identifier as string.
  - metadata
```
String metadata()
```
    Returns a String containing the column's metadata in json format.
    
    Returns:
    
    metadata as String
  - columnMetadata
```
ColumnMetadata columnMetadata()
```
  - rowComparator
```
it.unimi.dsi.fastutil.ints.IntComparator rowComparator()
```
  - first
```
default String first()
```
  - last
```
default String last()
```
  - append
```
void append(Column column)
```
  - first
```
default Column first(int numRows)
```
  - last
```
default Column last(int numRows)
```
  - print
```
String print()
```
  - title
```
default String title()
```
  - comment
```
String comment()
```
  - setComment
```
void setComment(String comment)
```
  - toDoubleArray
```
default double[] toDoubleArray()
```
  - columnWidth
```
int columnWidth()
```
  - isMissing
```
Selection isMissing()
```
  - isNotMissing
```
Selection isNotMissing()
```
  - byteSize
```
int byteSize()
```
    Returns the width of a cell in this column, in bytes.
    
    Returns:
    
    width in bytes
  - asBytes
```
byte[] asBytes(int rowNumber)
```
    Returns the contents of the cell at rowNumber as a byte[].
    
    Parameters:
    
    rowNumber - index of the row
    
    Returns:
    
    content as byte[]
  - difference
```
Column difference()
```
    Returns a new column of the same type as the receiver, such that the values in the new column contain the difference between each cell in the original and it's predecessor. The Missing Value Indicator is used for the first cell in the new column. (e.g. IntColumn.MISSING_VALUE)
    
    Returns:
    
    a Column
  - rolling
```
default RollingColumn rolling(int windowSize)
```

Interface Column

Method Summary

Method Detail

size

summary

subset

countMissing

countUnique

unique

name

setName

type

getString

emptyCopy

copy

emptyCopy

clear

sortAscending

sortDescending

isEmpty

appendCell

id

metadata

columnMetadata

rowComparator

first

last

append

first

last

print

title

comment

setComment

toDoubleArray

columnWidth

isMissing

isNotMissing

byteSize

asBytes

difference

rolling