Dataset

Type Parameters:

T - the type of data objects.

All Known Subinterfaces:

BinarySparseDataset, DataFrame, SparseDataset

All Known Implementing Classes:

IndexDataFrame
```
public interface Dataset<T>
```
An immutable collection of data objects.

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method and Description
`default T`	`apply(int i)` Returns the element at the specified position in this dataset.
`default boolean`	`distributed()` Returns true if the dataset is distributed over multiple machines.
`T`	`get(int i)` Returns the element at the specified position in this dataset.
`default boolean`	`isEmpty()` Returns true if the dataset is empty.
`static <T> Dataset<T>`	`of(java.util.Collection<T> data)` Returns a default implementation of Dataset from a collection.
`int`	`size()` Returns the number of elements in this collection.
`java.util.stream.Stream<T>`	`stream()` Returns a (possibly parallel) Stream with this collection as its source.
`static <T> java.util.stream.Collector<T,java.util.List<T>,Dataset<T>>`	`toDataset()` Returns a stream collector that accumulates elements into a Dataset.
`static <T> java.util.stream.Collector<double[],java.util.List<double[]>,smile.math.matrix.Matrix>`	`toMatrix()` Returns a stream collector that accumulates elements into a Matrix.
`default java.lang.String`	`toString(int numRows)` Returns the string representation of the row.

- Method Detail
  - distributed
```
default boolean distributed()
```
    Returns true if the dataset is distributed over multiple machines.
  - size
```
int size()
```
    Returns the number of elements in this collection.
  - isEmpty
```
default boolean isEmpty()
```
    Returns true if the dataset is empty.
  - get
```
T get(int i)
```
    Returns the element at the specified position in this dataset.
    
    Parameters:
    
    i - the index of the element to be returned.
  - apply
```
default T apply(int i)
```
    Returns the element at the specified position in this dataset.
    
    Parameters:
    
    i - the index of the element to be returned.
  - stream
```
java.util.stream.Stream<T> stream()
```
    Returns a (possibly parallel) Stream with this collection as its source.
    
    Returns:
    
    a (possibly parallel) Stream with this collection as its source.
  - toString
```
default java.lang.String toString(int numRows)
```
    Returns the string representation of the row.
    
    Parameters:
    
    numRows - Number of rows to show
  - of
```
static <T> Dataset<T> of(java.util.Collection<T> data)
```
    Returns a default implementation of Dataset from a collection.
  - toDataset
```
static <T> java.util.stream.Collector<T,java.util.List<T>,Dataset<T>> toDataset()
```
    Returns a stream collector that accumulates elements into a Dataset.
    
    Type Parameters:
    
    T - the type of input elements to the reduction operation
  - toMatrix
```
static <T> java.util.stream.Collector<double[],java.util.List<double[]>,smile.math.matrix.Matrix> toMatrix()
```
    Returns a stream collector that accumulates elements into a Matrix.

Interface Dataset<T>

Method Summary

Method Detail

distributed

size

isEmpty

get

apply

stream

toString

of

toDataset

toMatrix