@woosh/meep-engine/src/core/geom/vec/vector_axpy_offset.js

Pure JavaScript game engine. Fully featured and production ready.

/**
 * N-dimensional AXPY over offset slices of two flat buffers.
 *
 *     y[yOff + i] += alpha * x[xOff + i]   for i in [0, n)
 *
 * Use when the operands are columns/rows of a flat matrix; passing offsets
 * avoids per-call `.subarray(...)` header allocation.
 *
 * @param {number[]|Float32Array|Float64Array} y receives in-place update
 * @param {number} yOff starting index into y
 * @param {number} alpha
 * @param {number[]|Float32Array|Float64Array} x
 * @param {number} xOff starting index into x
 * @param {number} n number of elements
 */
export function vector_axpy_offset(y, yOff, alpha, x, xOff, n) {
    for (let i = 0; i < n; ++i) {
        y[yOff + i] += alpha * x[xOff + i];
    }
}