Upsample

Upsample[array, n] returns an upsampled version of the array by inserting n-1 zeros between array elements.

• Upsample[array, n, offset] shifts array so that its first element moves to the position offset in the resulting array.
• Upsample[array, n, offset, val] inserts n-1 elements of value val between array elements.
• Upsample[image, ...] upsamples an image.

Examples

Upsample by factor of 3:

Upsample[{1, 2, 3}, 3]
(* {1, 0, 0, 2, 0, 0, 3, 0, 0} *)

With offset:

Upsample[{1, 2}, 3, 2]
(* {0, 1, 0, 0, 2, 0} *)

With custom fill value:

Upsample[{1, 2, 3}, 2, 1, -1]
(* {1, -1, 2, -1, 3, -1} *)

Please visit the official Wolfram Language Reference for more details.