smile.data

Class IndexDataFrame

java.lang.Object

smile.data.IndexDataFrame

All Implemented Interfaces:

java.lang.Iterable<BaseVector>, DataFrame, Dataset<Tuple>

public class IndexDataFrame
extends java.lang.Object
implements DataFrame

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

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and 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.
int	columnIndex(java.lang.String name) Returns the index of a given column name.
DoubleVector	doubleVector(int i) Selects column based on the column index.
DataFrame	drop(int... cols) Returns a new DataFrame without given column indices.
FloatVector	floatVector(int i) Selects column based on the column index.
Tuple	get(int i) Returns the element at the specified position in this dataset.
java.lang.Object	get(int i, int j) Returns the cell at (i, j).
IntVector	intVector(int i) Selects column based on the column index.
java.util.Iterator<BaseVector>	iterator()
LongVector	longVector(int i) Selects column based on the column index.
DataFrame	merge(BaseVector... vectors) Merges data frames horizontally by columns.
DataFrame	merge(DataFrame... dataframes) Merges data frames horizontally by columns.
int	ncols() Returns the number of columns.
StructType	schema() Returns the schema of DataFrame.
DataFrame	select(int... cols) Selects a new DataFrame with given column indices.
ShortVector	shortVector(int i) Selects column based on the column index.
int	size() Returns the number of elements in this collection.
java.util.stream.Stream<Tuple>	stream() Returns a (possibly parallel) Stream with this collection as its source.
StringVector	stringVector(int i) Selects column based on the column index.
java.lang.String	toString()
DataFrame	union(DataFrame... dataframes) Merges 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, booleanVector, booleanVector, byteVector, byteVector, charVector, charVector, collect, collect, column, column, doubleVector, doubleVector, drop, factorize, 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, isNullAt, isNullAt, longVector, longVector, matrix, measures, names, nrows, of, of, of, of, of, of, of, of, of, of, of, of, of, omitNullRows, select, shortVector, shortVector, slice, stringVector, stringVector, structure, summary, toArray, toArray, toMatrix, toMatrix, toString, toString, toString, toString, toStrings, toStrings, types, vector, vector

Methods inherited from interface smile.data.Dataset

apply, distributed, isEmpty, of, toDataset, toMatrix

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

IndexDataFrame

public IndexDataFrame(DataFrame df,
                      int[] index)

Constructor.

Parameters:

df - The underlying data frame.

index - The row index.

Method Detail

schema

public StructType schema()

Description copied from interface: DataFrame

Returns the schema of DataFrame.

Specified by:

schema in interface DataFrame

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

iterator

public java.util.Iterator<BaseVector> iterator()

Specified by:

iterator in interface java.lang.Iterable<BaseVector>

columnIndex

public int columnIndex(java.lang.String name)

Description copied from interface: DataFrame

Returns the index of a given column name.

Specified by:

columnIndex in interface DataFrame

size

public int size()

Description copied from interface: Dataset

Returns the number of elements in this collection.

Specified by:

size in interface Dataset<Tuple>

ncols

public int ncols()

Description copied from interface: DataFrame

Returns the number of columns.

Specified by:

ncols in interface DataFrame

get

public java.lang.Object get(int i,
                            int j)

Description copied from interface: DataFrame

Returns the cell at (i, j).

Specified by:

get in interface DataFrame

stream

public java.util.stream.Stream<Tuple> stream()

Description copied from interface: Dataset

Returns a (possibly parallel) Stream with this collection as its source.

Specified by:

stream in interface Dataset<Tuple>

Returns:

a (possibly parallel) Stream with this collection as its source.

column

public BaseVector column(int i)

Description copied from interface: DataFrame

Selects column based on the column index.

Specified by:

column in interface DataFrame

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

booleanVector

public BooleanVector booleanVector(int i)

Description copied from interface: DataFrame

Selects column based on the column index.

Specified by:

booleanVector in interface DataFrame

charVector

public CharVector charVector(int i)

Description copied from interface: DataFrame

Selects column based on the column index.

Specified by:

charVector in interface DataFrame

byteVector

public ByteVector byteVector(int i)

Description copied from interface: DataFrame

Selects column based on the column index.

Specified by:

byteVector in interface DataFrame

shortVector

public ShortVector shortVector(int i)

Description copied from interface: DataFrame

Selects column based on the column index.

Specified by:

shortVector in interface DataFrame

intVector

public IntVector intVector(int i)

Description copied from interface: DataFrame

Selects column based on the column index.

Specified by:

intVector in interface DataFrame

longVector

public LongVector longVector(int i)

Description copied from interface: DataFrame

Selects column based on the column index.

Specified by:

longVector in interface DataFrame

floatVector

public FloatVector floatVector(int i)

Description copied from interface: DataFrame

Selects column based on the column index.

Specified by:

floatVector in interface DataFrame

doubleVector

public DoubleVector doubleVector(int i)

Description copied from interface: DataFrame

Selects column based on the column index.

Specified by:

doubleVector in interface DataFrame

stringVector

public StringVector stringVector(int i)

Description copied from interface: DataFrame

Selects column based on the column index.

Specified by:

stringVector in interface DataFrame

select

public DataFrame select(int... cols)

Description copied from interface: DataFrame

Selects a new DataFrame with given column indices.

Specified by:

select in interface DataFrame

drop

public DataFrame drop(int... cols)

Description copied from interface: DataFrame

Returns a new DataFrame without given column indices.

Specified by:

drop in interface DataFrame

merge

public DataFrame merge(DataFrame... dataframes)

Description copied from interface: DataFrame

Merges data frames horizontally by columns.

Specified by:

merge in interface DataFrame

Returns:

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

merge

public DataFrame merge(BaseVector... vectors)

Description copied from interface: DataFrame

Merges data frames horizontally by columns.

Specified by:

merge in interface DataFrame

Returns:

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

union

public DataFrame union(DataFrame... dataframes)

Description copied from interface: DataFrame

Merges data frames vertically by rows.

Specified by:

union in interface DataFrame

Returns:

a new data frame that combines all the rows.

get

public Tuple get(int i)

Description copied from interface: Dataset

Returns the element at the specified position in this dataset.

Specified by:

get in interface Dataset<Tuple>

Parameters:

i - the index of the element to be returned.