expand(array, xscale [, yscale, smooth])
Returns an expanded version of 1d or 2D
xscale is the magnification in the 1st dimension (may be
non-integer; may be < 1).
yscale is the magnification in
2nd dimension (defaults to
the smoothing type: 0: bilinear interpolation; else: nearest neighbor
!tvsmt). If the scale factors are 1 for both
array is returned immediately.
See also: compress, regrid, regrid3, !tvsmt