Pad or split mlx arrays

• mlx_pad() mirrors the MLX padding primitive, enlarging each axis according to pad_width. Values are added symmetrically (pad_width[i, 1] before, pad_width[i, 2] after) using the specified mode.

• mlx_split() divides an array along an axis either into equal sections (sections scalar) or at explicit 1-based split points (sections vector), returning a list of mlx arrays.

Usage

mlx_pad(
  x,
  pad_width,
  value = 0,
  mode = c("constant", "edge", "reflect", "symmetric"),
  axes = NULL
)

mlx_split(x, sections, axis = 1L)

Arguments

x

An mlx array, or an R array/matrix/vector that will be converted via as_mlx().

pad_width

Padding extents. Supply a single integer, a length-two numeric vector, or a matrix/list with one (before, after) pair per padded axis.

value

Constant fill value used when mode = "constant".

mode

Padding mode passed to MLX (e.g., "constant", "edge", "reflect").

axes

Optional integer vector of axes (1-indexed, negatives count from the end) to which pad_width applies. Unlisted axes receive zero padding.

sections

Either a single integer (number of equal parts) or an integer vector of 1-based split points along axis.

axis

Axis (1-indexed, negatives count from the end) to operate on.

Value

For mlx_pad(), an mlx array; for mlx_split(), a list of mlx arrays.

See also

mlx.core.pad

mlx.core.split

Examples

x <- as_mlx(matrix(1:4, 2, 2))
padded <- mlx_pad(x, pad_width = 1)
padded_cols <- mlx_pad(x, pad_width = c(0, 1), axes = 2)
parts <- mlx_split(x, sections = 2, axis = 1)
custom_parts <- mlx_split(x, sections = c(1), axis = 2)