com.eignex.koblas/core/F64VectorLike

F64VectorLike

interface F64VectorLike(source)

Read-only vector contract. Anything that only reads a vector should take this.

Inheritors

F64VectorView

Properties

size

abstract val size: Int(source)

Number of entries, counting the unstored zeros of a sparse vector.

Functions

get

abstract operator fun get(i: Int): Double(source)

The entry at index (i). Throws IndexOutOfBoundsException outside 0 until size, whatever the storage.

toDoubleArray

abstract fun toDoubleArray(): DoubleArray(source)

Materialise into a fresh dense DoubleArray, independent of the internal storage.

asum

fun F64VectorLike.asum(): Double

Sum of absolute values (BLAS dasum). Sparse vectors sum over stored entries only.

dot

infix fun F64VectorLike.dot(other: F64VectorLike): Double

aT * b. Any sparse operand goes through F64SparseKernels, walking the stored entries only.

forEachStored

inline fun F64VectorLike.forEachStored(block: (i: Int, v: Double) -> Unit)

Visit each stored entry as (index, value), in ascending index order for any storage. A F64SparseVector may present numerical zeros as stored, and any other F64VectorLike has every index visited.

iamax

fun F64VectorLike.iamax(): Int

Index of the entry with maximal absolute value (BLAS idamax), -1 for a zero-length vector. Ties resolve to the lowest index, and a vector with no stored entries returns 0.

norm2

fun F64VectorLike.norm2(): Double

Euclidean norm (BLAS dnrm2). Rescales when the sum of squares would overflow or underflow, so any finite input gives the correct norm.