/// Assign `$value` at `$matrix[$coords[1], $coords[2]]`
/// @group setters
/// @param {Matrix} $matrix - matrix to update
/// @param {List} $coords - (x y) coordinates
/// @param {*} $value - value to assign at $matrix[$x, $y]
/// @return {Matrix}
/// @require {function} _valid-coords
@function set-entry($matrix, $coords, $value) {
  @if length($coords) == 1 {
    $coords: ($coords $coords);
  }

  @if _valid-coords($coords, $matrix) {
    @return set-nth($matrix, nth($coords, 1), set-nth(nth($matrix, nth($coords, 1)), nth($coords, 2), $value));
  }

  @return false;
}