Enum ColumnData 

pub enum ColumnData {
    Numeric(Array1<f64>),
    Integer(Array1<i64>),
    String(Array1<String>),
    Bytes(Array2<u8>),
}

The values of one column, in the type the source uses.

Every variant except ColumnData::Bytes holds one value per sample. Bytes holds one row per sample, for a source whose columns have no individual names.

Examples

use dataset_ml::table::ColumnData;
use ndarray::array;

let counts = ColumnData::Integer(array![3, 5, 8]);
assert_eq!(counts.len(), 3);
assert_eq!(counts.kind(), "integer");
assert_eq!(counts.width(), 1);

Variants

Numeric(Array1<f64>)

A value with a fraction. A missing value is f64::NAN.

Integer(Array1<i64>)

A whole number.

String(Array1<String>)

Text, spelled as the source spells it. A missing value is the empty string, unless the dataset documents its own token.

Bytes(Array2<u8>)

A fixed-width row of unsigned bytes per sample, such as the pixels of an image. The columns inside the row have no individual names.

Implementations

impl ColumnData

pub fn len(&self) -> usize

The number of samples the column holds.

Returns

• usize - the sample count. For ColumnData::Bytes, this is the number of rows, not the number of bytes.

pub fn is_empty(&self) -> bool

Whether the column holds no sample.

Returns

• bool - true if the column holds no sample, and false if it holds at least one.

pub fn kind(&self) -> &'static str

The name of the variant this column holds.

Returns

• &'static str - one of "numeric", "integer", "string", or "bytes".

Notes

Table::numeric_matrix puts this name in the error it returns for a column it cannot read as a number.

pub fn width(&self) -> usize

The number of values this column contributes to one row of a matrix.

Returns

• usize - the row width. Every variant contributes 1, except ColumnData::Bytes, which contributes the number of bytes in one of its rows.

Trait Implementations

impl Clone for ColumnData

fn clone(&self) -> ColumnData

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ColumnData

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for ColumnData

fn eq(&self, other: &ColumnData) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for ColumnData