pandasx / Column

Class: Column

Defined in: src/core/column.ts:21

An immutable, typed, one-dimensional block of values. Series and DataFrame are thin wrappers that pair columns with an Index.

Constructors

Constructor

new Column(dtype, data, meta?): Column

Defined in: src/core/column.ts:26

Parameters

Parameter	Type
dtype	DType
data	Storage
meta	ColumnMeta

Returns

Column

Properties

Property	Modifier	Type	Defined in
data	readonly	Storage	src/core/column.ts:23
dtype	readonly	DType	src/core/column.ts:22
meta	readonly	ColumnMeta	src/core/column.ts:24

Accessors

length

Get Signature

get length(): number

Defined in: src/core/column.ts:85

Returns

number

Methods

astype()

astype(dtype, meta?): Column

Defined in: src/core/column.ts:228

Parameters

Parameter	Type
dtype	DType
meta	ColumnMeta

Returns

Column

---

concat()

static concat(cols): Column

Defined in: src/core/column.ts:249

Parameters

Parameter	Type
cols	readonly Column[]

Returns

Column

---

empty()

static empty(dtype?): Column

Defined in: src/core/column.ts:81

Parameters

Parameter	Type	Default value
dtype	DType	'object'

Returns

Column

---

from()

static from(values, dtype?, meta?): Column

Defined in: src/core/column.ts:32

Parameters

Parameter	Type
values	Iterable<unknown, any, any> | ArrayLike<unknown>
dtype?	DType
meta?	ColumnMeta

Returns

Column

---

fromLike()

static fromLike(values, like): Column

Defined in: src/core/column.ts:43

Builds a column from values keeping the dtype of like when the values fit (e.g. filling an Int64 column with integers stays Int64), upcasting otherwise.

Parameters

Parameter	Type
values	readonly unknown[]
like	Column

Returns

Column

---

full()

static full(n, value, dtype?, meta?): Column

Defined in: src/core/column.ts:71

A column of n copies of value.

Parameters

Parameter	Type
n	number
value	unknown
dtype?	DType
meta?	ColumnMeta

Returns

Column

---

get()

get(i): unknown

Defined in: src/core/column.ts:90

The JS value at position i (NaN for missing float64/int64, null otherwise).

Parameters

Parameter	Type
i	number

Returns

unknown

---

hasNA()

hasNA(): boolean

Defined in: src/core/column.ts:156

Returns

boolean

---

isNA()

isNA(i): boolean

Defined in: src/core/column.ts:140

Parameters

Parameter	Type
i	number

Returns

boolean

---

map()

map(fn, dtype?): Column

Defined in: src/core/column.ts:208

Element-wise transform; the output dtype is inferred unless given.

Parameters

Parameter	Type
fn	(value, i) => unknown
dtype?	DType

Returns

Column

---

mapLike()

mapLike(fn): Column

Defined in: src/core/column.ts:215

Like map, but keeps this column's dtype when the results fit.

Parameters

Parameter	Type
fn	(value, i) => unknown

Returns

Column

---

raw()

raw(i): unknown

Defined in: src/core/column.ts:134

A primitive cheap to compare: numbers for numeric/temporal storage, category codes for ordered categoricals.

Parameters

Parameter	Type
i	number

Returns

unknown

---

setAt()

setAt(positions, values): Column

Defined in: src/core/column.ts:222

Copy with values(k) written at positions[k] (dtype upcast as needed).

Parameters

Parameter	Type
positions	readonly number[]
values	(k) => unknown

Returns

Column

---

slice()

slice(start, end): Column

Defined in: src/core/column.ts:203

Parameters

Parameter	Type
start	number
end	number

Returns

Column

---

take()

take(positions): Column

Defined in: src/core/column.ts:169

Gathers positions; a position of -1 yields a missing value (upcasting if required).

Parameters

Parameter	Type
positions	ArrayLike<number>

Returns

Column

---

toArray()

toArray(): unknown[]

Defined in: src/core/column.ts:162

Returns

unknown[]