d4array

Creates a 4D 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, k, m) indices, use d4arrayIndices.

Signature

inline fun <reified T : Any> Multik.d4array(
    sizeD1: Int,
    sizeD2: Int,
    sizeD3: Int,
    sizeD4: Int,
    noinline init: (Int) -> T
): D4Array<T>

Parameters

Parameter	Type	Description
`sizeD1`	`Int`	Size of the first axis. Must be positive.
`sizeD2`	`Int`	Size of the second axis. Must be positive.
`sizeD3`	`Int`	Size of the third axis. Must be positive.
`sizeD4`	`Int`	Size of the fourth axis. Must be positive.
`init`	`(Int) -> T`	Lambda that receives a flat index (0 to `sizeD1 * sizeD2 * sizeD3 * sizeD4 - 1`). Elements are filled in row-major order.

Returns: D4Array<T>

Example

val a = mk.d4array<Double>(2, 3, 4, 5) { it.toDouble() }
// shape (2, 3, 4, 5), 120 elements

28 February 2026