Insert a broadcast axis at an arbitrary position.

The rank-general sibling of g_rep_t(): expands x with a new axis of n copies at position axis, so a reduced statistic broadcasts back against the array it came from (base R arrays do not broadcast, so the untraced path materialises the copies; traced, this is a free broadcast_to).

Usage

g_expand(x, axis, n)

Arguments

x

Array (traced or plain).

axis

1-based position of the new axis in the output.

n

Length of the new axis.

Value

Array of rank length(dim(x)) + 1.