Package smile.data

Class IndexDataFrame

java.lang.Object

smile.data.IndexDataFrame

All Implemented Interfaces:

Iterable<Tuple>, DataFrame

public class IndexDataFrame
extends Object
implements DataFrame

A data frame with a new index instead of the default [0, n) row index.

Nested Class Summary

Nested classes/interfaces inherited from interface smile.data.DataFrame

DataFrame.Collectors

Constructor Summary

Constructors

Constructor	Description
IndexDataFrame(DataFrame df, int[] index)	Constructor.

Method Summary

Modifier and Type	Method	Description
BooleanVector	booleanVector(int i)	Selects column based on the column index.
ByteVector	byteVector(int i)	Selects column based on the column index.
CharVector	charVector(int i)	Selects column based on the column index.
BaseVector	column(int i)	Selects column based on the column index.
DoubleVector	doubleVector(int i)	Selects column based on the column index.
DataFrame	drop(int... cols)	Returns a new DataFrame without selected columns.
FloatVector	floatVector(int i)	Selects column based on the column index.
Tuple	get(int i)	Returns the row at the specified index.
Object	get(int i, int j)	Returns the cell at (i, j).
int	indexOf(String name)	Returns the index of a given column name.
IntVector	intVector(int i)	Selects column based on the column index.
Iterator<Tuple>	iterator()
LongVector	longVector(int i)	Selects column based on the column index.
DataFrame	merge(DataFrame... dataframes)	Merges data frames horizontally by columns.
DataFrame	merge(BaseVector... vectors)	Merges vectors with this data frame.
int	ncol()	Returns the number of columns.
StructType	schema()	Returns the schema of DataFrame.
DataFrame	select(int... cols)	Returns a new DataFrame with selected columns.
ShortVector	shortVector(int i)	Selects column based on the column index.
int	size()	Returns the number of rows.
Stream<Tuple>	stream()	Returns a (possibly parallel) Stream of rows.
StringVector	stringVector(int i)	Selects column based on the column index.
String	toString()
DataFrame	union(DataFrame... dataframes)	Unions data frames vertically by rows.
<T> Vector<T>	vector(int i)	Selects column based on the column index.

Methods inherited from class java.lang.Object

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

Methods inherited from interface smile.data.DataFrame

apply, apply, apply, booleanVector, booleanVector, byteVector, byteVector, charVector, charVector, column, column, doubleVector, doubleVector, drop, factorize, fillna, floatVector, floatVector, get, getArray, getArray, getBoolean, getBoolean, getByte, getByte, getChar, getChar, getDate, getDate, getDateTime, getDateTime, getDecimal, getDecimal, getDouble, getDouble, getFloat, getFloat, getInt, getInt, getLong, getLong, getScale, getScale, getShort, getShort, getString, getString, getStruct, getStruct, getTime, getTime, intVector, intVector, isEmpty, isNullAt, isNullAt, longVector, longVector, measures, names, nrow, of, of, omitNullRows, select, shortVector, shortVector, slice, stringVector, stringVector, structure, summary, toArray, toArray, toList, toMatrix, toMatrix, toString, toString, toString, toString, toStrings, toStrings, types, vector, vector

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Details

IndexDataFrame

public IndexDataFrame(DataFrame df,
 int[] index)

Constructor.

Parameters:

df - The underlying data frame.

index - The row index.

Method Details

schema

public StructType schema()

Description copied from interface: DataFrame

Returns the schema of DataFrame.

Specified by:

schema in interface DataFrame

Returns:

the schema.

toString

public String toString()

Overrides:

toString in class Object

indexOf

public int indexOf(String name)

Description copied from interface: DataFrame

Returns the index of a given column name.

Specified by:

indexOf in interface DataFrame

Parameters:

name - the column name.

Returns:

the index of column.

size

public int size()

Description copied from interface: DataFrame

Returns the number of rows.

Specified by:

size in interface DataFrame

Returns:

the number of rows.

ncol

public int ncol()

Description copied from interface: DataFrame

Returns the number of columns.

Specified by:

ncol in interface DataFrame

Returns:

the number of columns.

get

public Object get(int i,
 int j)

Description copied from interface: DataFrame

Returns the cell at (i, j).

Specified by:

get in interface DataFrame

Parameters:

i - the row index.

j - the column index.

Returns:

the cell value.

stream

public Stream<Tuple> stream()

Description copied from interface: DataFrame

Returns a (possibly parallel) Stream of rows.

Specified by:

stream in interface DataFrame

Returns:

a (possibly parallel) Stream of rows.

iterator

public Iterator<Tuple> iterator()

Specified by:

iterator in interface Iterable<Tuple>

column

public BaseVector column(int i)

Description copied from interface: DataFrame

Selects column based on the column index.

Specified by:

column in interface DataFrame

Parameters:

i - the column index.

Returns:

the column vector.

vector

public <T> Vector<T> vector(int i)

Description copied from interface: DataFrame

Selects column based on the column index.

Specified by:

vector in interface DataFrame

Type Parameters:

T - the data type of column.

Parameters:

i - the column index.

Returns:

the column vector.

booleanVector

public BooleanVector booleanVector(int i)

Description copied from interface: DataFrame

Selects column based on the column index.

Specified by:

booleanVector in interface DataFrame

Parameters:

i - the column index.

Returns:

the column vector.

charVector

public CharVector charVector(int i)

Description copied from interface: DataFrame

Selects column based on the column index.

Specified by:

charVector in interface DataFrame

Parameters:

i - the column index.

Returns:

the column vector.

byteVector

public ByteVector byteVector(int i)

Description copied from interface: DataFrame

Selects column based on the column index.

Specified by:

byteVector in interface DataFrame

Parameters:

i - the column index.

Returns:

the column vector.

shortVector

public ShortVector shortVector(int i)

Description copied from interface: DataFrame

Selects column based on the column index.

Specified by:

shortVector in interface DataFrame

Parameters:

i - the column index.

Returns:

the column vector.

intVector

public IntVector intVector(int i)

Description copied from interface: DataFrame

Selects column based on the column index.

Specified by:

intVector in interface DataFrame

Parameters:

i - the column index.

Returns:

the column vector.

longVector

public LongVector longVector(int i)

Description copied from interface: DataFrame

Selects column based on the column index.

Specified by:

longVector in interface DataFrame

Parameters:

i - the column index.

Returns:

the column vector.

floatVector

public FloatVector floatVector(int i)

Description copied from interface: DataFrame

Selects column based on the column index.

Specified by:

floatVector in interface DataFrame

Parameters:

i - the column index.

Returns:

the column vector.

doubleVector

public DoubleVector doubleVector(int i)

Description copied from interface: DataFrame

Selects column based on the column index.

Specified by:

doubleVector in interface DataFrame

Parameters:

i - the column index.

Returns:

the column vector.

stringVector

public StringVector stringVector(int i)

Description copied from interface: DataFrame

Selects column based on the column index.

Specified by:

stringVector in interface DataFrame

Parameters:

i - the column index.

Returns:

the column vector.

select

public DataFrame select(int... cols)

Description copied from interface: DataFrame

Returns a new DataFrame with selected columns.

Specified by:

select in interface DataFrame

Parameters:

cols - the column indices.

Returns:

a new DataFrame with selected columns.

drop

public DataFrame drop(int... cols)

Description copied from interface: DataFrame

Returns a new DataFrame without selected columns.

Specified by:

drop in interface DataFrame

Parameters:

cols - the column indices.

Returns:

a new DataFrame without selected columns.

merge

public DataFrame merge(DataFrame... dataframes)

Description copied from interface: DataFrame

Merges data frames horizontally by columns.

Specified by:

merge in interface DataFrame

Parameters:

dataframes - the data frames to merge.

Returns:

a new data frame that combines this DataFrame with one more other DataFrames by columns.

merge

public DataFrame merge(BaseVector... vectors)

Description copied from interface: DataFrame

Merges vectors with this data frame.

Specified by:

merge in interface DataFrame

Parameters:

vectors - the vectors to merge.

Returns:

a new data frame that combines this DataFrame with one more additional vectors.

union

public DataFrame union(DataFrame... dataframes)

Description copied from interface: DataFrame

Unions data frames vertically by rows.

Specified by:

union in interface DataFrame

Parameters:

dataframes - the data frames to union.

Returns:

a new data frame that combines all the rows.

get

public Tuple get(int i)

Description copied from interface: DataFrame

Returns the row at the specified index.

Specified by:

get in interface DataFrame

Parameters:

i - the row index.

Returns:

the i-th row.