Type

DataType enum

DataType identifies the element type of an NDArray at runtime. It is stored in the dtype property of every array.

public enum class DataType(
    public val nativeCode: Int,
    public val itemSize: Int,
    public val clazz: KClass<out Any>
)

Values

Constant	nativeCode	itemSize	Kotlin class
`ByteDataType`	1	1	`Byte`
`ShortDataType`	2	2	`Short`
`IntDataType`	3	4	`Int`
`LongDataType`	4	8	`Long`
`FloatDataType`	5	4	`Float`
`DoubleDataType`	6	8	`Double`
`ComplexFloatDataType`	7	8	`ComplexFloat`
`ComplexDoubleDataType`	8	16	`ComplexDouble`

Properties

Property	Type	Description
`nativeCode`	`Int`	Integer identifier used by the JNI layer (1–8).
`itemSize`	`Int`	Bytes per element.
`clazz`	`KClass<out Any>`	Corresponding Kotlin class.

Instance methods

isNumber

fun isNumber(): Boolean

Returns true for types 1–6 (non-complex numeric types).

isComplex

fun isComplex(): Boolean

Returns true for ComplexFloatDataType and ComplexDoubleDataType.

Companion methods

of (by native code)

fun of(i: Int): DataType

Returns the DataType matching the given nativeCode. Throws if i is out of range.

of (by element)

fun <T : Any> of(element: T): DataType

Infers the DataType from an element instance.

ofKClass

fun <T : Any> ofKClass(type: KClass<out T>): DataType

Resolves a DataType from a KClass.

Usage

val a = mk.ndarray(mk[1.0, 2.0, 3.0])

a.dtype                          // DataType.DoubleDataType
a.dtype.nativeCode               // 6
a.dtype.itemSize                 // 8
a.dtype.isNumber()               // true
a.dtype.isComplex()              // false

DataType.of(3)                   // DataType.IntDataType
DataType.ofKClass(Float::class)  // DataType.FloatDataType

19 February 2026