d2array

Creates a 2D array of the given shape, where each element is computed by a flat-index init function. Elements are filled in row-major order. For per-element (i, j) indices, use d2arrayIndices.

Signature

inline fun <reified T : Any> Multik.d2array(
    sizeD1: Int,
    sizeD2: Int,
    noinline init: (Int) -> T
): D2Array<T>

Parameters

Parameter	Type	Description
`sizeD1`	`Int`	Number of rows. Must be positive.
`sizeD2`	`Int`	Number of columns. Must be positive.
`init`	`(Int) -> T`	Lambda that receives a flat index (0 to `sizeD1 * sizeD2 - 1`) and returns the element value. Elements are filled in row-major order.

Returns: D2Array<T>

Example

val m = mk.d2array<Int>(2, 3) { it }
// [[0, 1, 2],
//  [3, 4, 5]]

val identity = mk.d2array<Double>(3, 3) { if (it / 3 == it % 3) 1.0 else 0.0 }

28 February 2026