function enlarge

Enlarges X by specified integer SCALE.

Syntax
result = enlarge(X, SCALE [, method])

Arguments
X:   The array to be enlarged
SCALE:   The resulting array will be SIZE times bigger than X
method:   Optional, determines how to enlarge:
method = 0:   Center original image (default)
method = 1:   Center original image, edge values are mean of edge
method = 2:   Blow up pixels